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As a collector,, the "devil is in the details" so to speak. And the info above about the silver medallions is correct. There have been several different variations of medallions over the years. I didn't dwell upon the silver ones as it doesn't apply to the OM 41 here.
BUT,, one thing I didn't mention,, is for about a year or so,, there was a black eagle medallion where the bird has "neck feathers." Generally those were on 1967 produced guns. So, again, it wouldn't apply to this gun,, but be aware of that little difference. And the neck feather medallion grips usually cost more money.
So yes,, we can go into "deep details" here to make a gun correct & "as shipped."
The letter will let you know how it was shipped,, with a model info of maybe "BKH-41" or if truly rare & lucky,, "BKH-41B" as well as where it was initially shipped to.