Beer can dating
In September 1935, the first cap sealed cone type style beer can was introduced by the Continental Can Company for the Schlitz Brewing Company.Crown Cork and Seal become the fourth beer can manufacturer in 1936 after acquiring the Acme Can Company of Philadelphia, Pennsylvania.Crowntainer was a trademark by the Crown Cork and Seal Company that was registered with the US Patent Office & Trademark Office (USPTO).The early Crowntainer cans carried a statement stating that the patent had been registered.On October 1, 1938, this wordy statement was shortened to Internal Revenue Tax Paid (IRTP).Since crowntainers weren't produced until late 1939, most of them until March 30, 1950 carried the shorter statement saying Internal Revenue Tax Paid. Sometimes, the brewery abbreviated the words Internal Revenue such as Int Revenue Tax Paid, Internal Rev Tax Paid and Int Rev Tax Paid.Some breweries included the date when their company began brewing, but without the number of years in business at the time the can was made, there isnt enough data to calculate the year in which the can was produced.
The copyright date can be misleading because it reflects the year when the brand name was trademarked, not necessarily when that style or version of the can was produced.
Regardless of the actual verbiage, if a crowntainer has an IRTP statement, then it was made between September 1939 and March 30, 1950.
Nearly 80% of crowntainers carry an IRTP statement. In the case of IRTP statement, there was another exception.
In 1937, Crown Cork and Seal introduced their own version of a cap sealed cone top called a J-Spout.
Because of manufacturing problems with the J-Spout, the Crown Cork and Seal Company soon gave up on them and introduced a new two-piece cone top can in late 1939.