Variation - 2 cans that look the same, but are not exactly the same. A variation can be different cities the cans is made in, a change in the ingredients, steel or aluminum can, different kind of top etc.
WF - Abriviation for withdrawn free
Withdrawn Free - A can produced for sale by a brewery in the US for sale outside the United States or for sale on a US military base in the US before March, 1950. Withdrawn free cans included all camouflage cans, but also include non-camouflaged cans. They are marked with a variation of the IRTP statement, noting that the federal tax was not due for this item and so was not paid.