Jokka,
No they are not marked "HSc". They are usually marked with a three letter code and a date or a commercial maker logo.
Like I said they were made by many different firms.
One quick way to determine if it is for the HSc is to look at the toe of the holster. The toes of HSc holsters are larger than any other to accommodate the large snout of the HSc.
R.Blue
Rosco is correct, but some of them are marked as such, "Mauser 7.65" inside. See 1st photo below. Now, sometimes these of course could be for a Mauser 1934 as well. The 3rd photo is of a 1934 holster.
And the 2nd photo is the front of the HSc holster.
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