Your revolver dates to 1920-1921, and is well after the SN where heat-treating of the cylinder began. It was made very close to the date when the caliber marking changed from .32 W.C.F. CTGE to .32-20 CTGE. As tops stated, they are the same cartridge.
Any 100-115 gr ammunition with a flat point bullet is correct for your revolver. If you find any old ammunition that looks like the cartridge on the right in the picture below, the hollow-point, this is the type that should not be fired in a revolver. Anything that looks like any of the other cartridges in the picture is OK. All .32-20 is marked for revolver and rifle use, as long as it isn't this hollow-point type it can be used, regardless of when it was made.
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Gunsmithing since 1961
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