Here is how I am figuring it and I do think it is correct. std size is 4 11/16 " which is to be 4.6875 now add .045" for an oversize and get 4.7325 now that is the BORE SIZE. Now you need clearance so for an aluminum piston lets go with .010" (cast iron would go .006" )so deduct .010" from 4.7325 and I get EXACTLY what your piston measures 4.7225
So I say you have .045" oversized pistons for either a late B or 50 or even 520-530 ? depending on what they look like. If the tops look good and not corroded ? it seems strange there is not a marking on the top of them ? Maybe they are corroded or been ground on ? A 50 would usually have thinner piston rings than a B and a 520-530 IIRC have a dome shape on top.
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