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In 1944, the war department allowed the auto manufacturers to start manufacturing replacement engines again and the first design was a cross between the prewar 221 and the wartime 239 engines. It received the model designation 41A (1944 221 CID)but by the time it was cleared for production the 59A engine was also cleared for production. Ford likely used the same casting containment for both engines but the 221 engine has different cores so it has characteristics of both engines. The 41A block surprises a lot of folks since it had 3 1/16 bores and 221 characteristics with a big "59" on the back bell.
Prewar engines have no 59 on the back bell so that is a possibility. Valve angle changed on the 59 series from prewar. Not all 59 series engines have the 59 on the back to confuse things even further but there are other characteristics like the little unfinished boss near the oil ports on the back bell of the engine that are 59 series.