Dating hole in cap cans
Schlitz cans are the exception as they were especially good with copyright dates because they redesigned their cans every couple of years.
You'll find Schlitz cans with copyright dates of 1946, 1949, 1954, 1957, 1958, 1960, 19 and dates afterwards.
And why are craft breweries now turning to cans, too?
Krueger’s Finest Beer, Krueger’s Cream Ale and Krueger’s Special Beer (all at 3.2 percent ABV Though today beer cans are made from aluminum, those early cans were constructed out of heavy gauged steel coated with a thin layer of tin to prevent rusting.
Look along the seam for the year on most Schlitz cans.
Look and see if there is a tax statement on the can, along the lines of "Internal Revenue Tax Paid" or "Withdrawn Free of Internal Revenue Tax" if so, then the can dates before March 1950.
-The glass is clear (colorless) with just the slightest "straw" tint when looking through the thick portion of the base.This page provides some examples of how to use the website (primarily the Bottle Dating pages) to determine the approximate date or date range for various types of bottles made between the early 1800s and the mid-20th century.The bottles used for illustration are a small but diverse assortment designed to give users guidance on how to work a bottle through the dating information to answer the Homepage's primary question #1 - What is the age of the bottle?In addition to its packaging material, the beer can's shape also changed over time.Though the first cans looked like cylinders with flat tops and bottoms, producers eventually introduced cans with cone tops.