by all means keep the 1942 holster with your dad's pistol. your dad got that gun and holster during ww2 and we assume it was liberated from a german soldier as a pair.
yes the 1915 dated gun must have had a ww1 era holster at some time. but the history of the gun surviving in germany through the 1920s and 1930s and then the gun was put into service in ww2 with the 1942 holster just adds to this guns overall history.
when your father passes, this gun/holster will be your family treasure as a keepsake from your father.
one question : does this gun have a 1920 date stamped just above the original 1915 date on the top of the chamber?
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