For 32 oz cans see Quarts and for gallon cans see Gallons.
Cone tops came into use in 1935 and the last one was used by Rice Lake Brewing in 1960.
By 1967 few brewers still used flat top cans that had to be opened with a church key. Only three brewers that used opening instructions on their cans after 1950; Genesee, Sterling, and Falls City. Aluminum cans came into wide use in the 1970s but the first ones were being sold by Primo and Coors in 1958-1959. A few other brewers including National, Hamms, and Budweiser started using them in the early to mid 1960s. Flat top 15 and 16 oz cans came into use starting in 1953 so a flat top 16 oz can would date between 1953-1964.
The original low profile cans had flat bottoms and inverted ribs on the top. Krueger Brewing made the only 16 oz cone top in about 1940. The ale was a tough can until a couple hundred were found in a barn in Vermont.Before that date brewers had to include a tax statement.Note: A handful of the very first cans from 1935 do not have this statement.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Schlitz cans.Look and see if there is a tax statement on the can, along the lines of "Internal Revenue Tax Paid" or "Withdrawn Free of Internal Revenue Tax" if so, then the can dates before March 1950.The exceptions are fake beer cans made for collectors during the 1970s.