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yeah the tto is 48-50, no date code + notched bar, also notched/lined blade tray. To me the 3 piece looks like an old type too.

I dont think you'll be able to narrow either down to an exact year....

does the 3piece have date codes? pics will help ;) if its from the 20's its probably either an old or new type... yeah descriptive :P old razors sometimes had serial numbers which can be dated, if...