A Guide to Dating 7up Bottles

The humble beverage bottle, often discarded without a second thought, can be a fascinating artifact for those who know how to read its hidden clues. For collectors and history enthusiasts, dating these glass vessels offers a tangible connection to the past, revealing insights into manufacturing techniques, branding evolution, and even societal changes. Among the myriad of soft drink bottles, 7up bottles hold a special place, representing a century of refreshing moments. This detailed guide will equip you with the knowledge to accurately date your 7up bottles, transforming them from mere containers into valuable pieces of history.

7up, originally introduced as “Bib-Label Lithiated Lemon-Lime Soda” in 1929 by Charles Leiper Grigg, quickly rebranded to its more familiar name in 1930. Its long history means there’s a wide variety of bottle types, designs, and markings to explore. Understanding these variations is key to precise dating.

Key Features for Dating 7up Bottles

Dating glass bottles, especially those from mass-produced brands like 7up, relies on a combination of visual cues and manufacturer’s marks. No single feature tells the whole story; rather, it’s the confluence of several elements that allows for an accurate timeline.

Bottle Shape and Manufacturing Techniques

• Applied Tops (Pre-1910, though rare for 7up): While 7up itself started in 1929, early soda bottles often featured applied tops where the lip was manually shaped and applied to the bottle body. This technique resulted in a visible seam around the neck. Given 7up’s inception date, finding an applied top 7up bottle would be highly unusual and likely indicates a very early, possibly experimental, or a non-7up bottle mistaken for one.
• Crown Tops (Post-1892): The invention of the crown cap in 1892 revolutionized bottling. All 7up bottles, from their earliest days, were designed for crown caps. Early crown-top bottles, particularly those from the 1930s and 40s, often have slightly thicker glass and a more pronounced, rounded lip to accommodate the cap.
• Machine-Made Bottles (Early 20th Century Onwards): By the 1920s, automatic bottle-making machines were dominant. This means that even the earliest 7up bottles were machine-made. Machine-made bottles are characterized by mold seams that typically run all the way to the top of the lip. The absence of an applied top seam is a strong indicator of machine production.
• Standardization: Over time, bottle shapes for popular beverages like 7up became more standardized, moving from more generic “slug plate” designs (where only a specific section of the mold was changed for branding) to fully customized molds.

Embossing and Labels

The way the 7up brand name and other information are presented on the bottle provides crucial dating clues.

• Embossed Bottles (1930s ⏤ 1950s): Early 7up bottles prominently featured the brand name, and sometimes the full “Lithiated Lemon-Lime Soda” descriptor, embossed directly into the glass. The font, size, and placement of this embossing changed over the decades. Look for:
  • “The Bib-Label Lithiated Lemon-Lime Soda” (Very early, 1929-1930, extremely rare).
  • “7-Up” with a hyphen (Common in the 1930s and 1940s).
  • “Seven-Up” spelled out (Sometimes seen, especially on earlier examples).
  • “Fresh Up” slogan (Often embossed or later ACL, from the 1950s onwards);
  • Company name like “Howdy Corporation” (original parent company) or “The Seven-Up Company” (later).
• Applied Color Labeling (ACL) (1940s ⎯ Present): ACL, also known as pyroglaze, is a process where ceramic paint is fused onto the glass at high temperatures. This allowed for more colorful and detailed labels than embossing. 7up widely adopted ACL labels from the late 1940s/early 1950s. Key indicators include:
  • Design Evolution: The 7up logo itself changed significantly over time. Early ACLs feature the classic red and green logo, often with “Fresh Up” or “It’s a Grahame-Cracker!” (a lesser-known early slogan). Later designs incorporated the “Uncola” campaign graphics (1970s) and subsequent modernizations.
  • Copyright Dates: Some ACL labels include small copyright dates, which can be a direct dating clue. These are usually found near the bottom edge of the label.
  • Slogans: The slogans used on ACL bottles are excellent dating tools. “Fresh Up with 7up” (1950s-1960s), “The Uncola” (1970s), and others provide clear historical markers.

Base Markings and Manufacturer Codes

The bottom (base) of a 7up bottle is often the most reliable source for precise dating. Manufacturers routinely stamped codes into the glass, typically including a date code, a manufacturer’s mark, and sometimes a mold number.

• Manufacturer’s Mark: The vast majority of American 7up bottles were made by large glass companies. Recognizing their logos is crucial:
  • Owens-Illinois Glass Company (O-I): The most prolific manufacturer. Their mark is usually an ‘I’ inside an ‘O’ with a diamond around it, or later just an ‘I’ in an ‘O’.
  • Anchor Hocking Glass Company (AH): Often an anchor symbol over an ‘H’.
  • Thatcher Glass Manufacturing Company: A ‘T’ inside a triangle.
  • Knox Glass Bottle Company: A ‘K’ in a circle.
  • Root Glass Company: An ‘R’ in a square (famous for early Coca-Cola bottles, but also produced other sodas).
• Date Codes: This is where the magic happens. Date codes vary by manufacturer, but common formats include:
  • Two-Digit Year: Often found next to the manufacturer’s mark. For example, ’58’ would indicate 1958. This is common on Owens-Illinois bottles.
  • Single Digit or Dot System: Some manufacturers used a single digit (e.g., ‘6’ for 1946 or 1956, requiring context) or a series of dots to indicate the year.
  • Month/Year Codes: Less common on soda bottles, but sometimes seen as a number indicating the month and another for the year (e.g., ’12-55′ for December 1955).

  Important Note: The date code indicates when the bottle was manufactured, not necessarily when it was filled or sold. However, bottles were typically filled shortly after production.

• Plant Codes: Often a letter or number indicating the specific factory where the bottle was made. This is usually less helpful for dating but can be interesting for collectors interested in regional variations.
• Mold Numbers: A number indicating the specific mold used in the bottle-making machine. Also less useful for dating, but important for identifying variations within a specific production run.

Glass Color and Clarity

• Clear Glass: Most 7up bottles are made of clear flint glass.
• Green Tint: Some very early 7up bottles, particularly those from the 1930s and 1940s, might exhibit a slight green or aqua tint due to impurities in the sand used for glassmaking or intentional coloration. This tint generally faded as glass manufacturing processes improved. While not a definitive dating method, a noticeable tint can suggest an older bottle.

Patent Dates

Occasionally, a patent date related to the bottle’s design or closure mechanism might be embossed on the bottle. These are less common on 7up bottles compared to some other brands but are definitive dating markers if present.

Historical Timeline of 7up Bottle Evolution

Let’s put these features into a chronological context for 7up:

• 1929-1930: The Bib-Label Era: Bottles would have been embossed, likely with “Bib-Label Lithiated Lemon-Lime Soda” or similar wording. These are exceedingly rare and highly sought after. They would be machine-made with crown tops.
• 1930s ⎯ Early 1940s: Early 7up Embossed Bottles: Bottles typically embossed with “7-Up” (with a hyphen) and often “Lithiated Lemon-Lime Soda.” Glass might have a slight aqua or green tint. Manufacturer marks and two-digit date codes on the base are common. Shapes were relatively simple, often a straight-sided or slightly tapered cylinder.
• Late 1940s ⎯ 1950s: Transition to ACL: This period saw the gradual introduction and widespread adoption of Applied Color Labels. Early ACL bottles might still have some embossing (e.g., “7-Up” near the neck) in addition to the painted label. The “Fresh Up with 7up” slogan became prominent. The classic red and green 7up logo was established.
• 1960s ⎯ 1970s: The “Uncola” Era: Bottles are predominantly ACL, featuring the iconic “Uncola” campaign graphics and slogans; The 7up logo itself underwent minor refinements. Bottle shapes became more standardized and often featured a slightly more contoured design. Date codes on the base remain crucial.
• 1980s ⏤ 1990s: Modernization: Further changes to the 7up logo and branding. Bottles are almost exclusively ACL or later, fully printed labels. Twist-off caps became more common, though the bottle design itself might not dramatically change based on this.
• 2000s ⏤ Present: Contemporary Designs: Bottles continue to evolve with modern branding, often incorporating plastic labels or sleeker designs. These are generally not considered “collectible” in the same vein as older glass bottles but show the ongoing evolution.

Challenges and Nuances in Dating

• Reused Molds: While date codes are reliable, sometimes a bottle mold might be used slightly past its intended date, or a bottle from an older mold might be produced later. Always cross-reference with other features.
• Regional Variations: Different bottling plants or regions might have used slightly different bottle designs or manufacturers, leading to minor variations.
• Transitional Periods: During periods of change (e.g., from embossed to ACL), you might find “hybrid” bottles that incorporate elements of both old and new designs.
• Wear and Tear: Heavy wear can obscure embossed details or base markings, making identification difficult.
• Cleaning: Over-aggressive cleaning can damage ACL labels, reducing their clarity and value.

Dating 7up bottles is a rewarding endeavor that connects collectors to the rich history of one of America’s beloved beverages. By meticulously examining the bottle’s shape, the presence and style of embossing or ACL labels, the slogans used, and most importantly, the manufacturer’s and date codes on the base, you can accurately pinpoint its age. Each bottle tells a silent story of its creation, its journey through time, and the evolving tastes and technologies of an era. So, the next time you encounter an old 7up bottle, take a moment to look beyond the glass; you might just uncover a fascinating piece of history waiting to be dated and appreciated.

Happy hunting and happy dating!