USMC marked holster

I have a Clark break front cross draw holster stamped USMC with a dedicated stamp.
Have no idea how it came to be stamped USMC. It seems to have been black at some time but now is mostly brown.

https://www.milsurps.com/images/impo...P1010824-1.jpg
https://www.milsurps.com/images/impo...P1010825-1.jpg
https://www.milsurps.com/images/impo...10108261-1.jpg

Came with non-martially marked 1892 Colt circa 1905 and shows makes from this rev. in the interior. However, it was apparently used with a shorter revolver at some time by additional marks in the interior.
Hoping someone has some idea what this is.
Dan

These stamps are available at this time. I don't think this is a military issue anything...

Thanks for the reply.
It does not appear to be a recent stamping. But the Holster does not make any sense in the Marine Corps either. Just fishing for ideas for the lady that owns it. No provenance of any kind and I don't know where she came up with it and the revolver. Many things are stranger than fiction and many things are faked too or spuriously marked. So the question was asked.
These holsters were very popular with the police at one time and the belt loop is large and would fit some military belts. Still it shows little sign of having a belt through the loop.

Also, the military had been using black for their leather holsters for decades. This one just doesn't fit in any of their equipment scale. The holsters used by the US Air Force MPs were vastly different and they used revolvers...stamp sets have been available for some time and it's hard to say when this was stamped. There ARE others here that will have a firm grasp on this subject and I expect them to jump in shortly.

United Shoe Machinery Company. I can hear the the quiet chuckling amongst the doubters. Don't take my word for it.......look it up.

For G*d sakes...

Looks like a private purchase holster that someone had stamped with the USMC. Not military issue.

Thank you...

I looked at the United Shoe Machinery Company and found nothing about holsters...

Clark was a known name in Holster making so I doubt they were affiliated with the Shoe Machinery Co. Since it shows some sign of being blackened at some time I had though it might be some private purchase thing. But why it would have been used with a 4"-6" revolver anytime since WW-I had me stumped. Holster does not seem large enough for a 1917. I can't find anything about dates of Clark holsters except it likely dates to before the mid-50s.
Anyway thanks everyone for the comments. Everyone else I have talked to about it seems to follow the private purchase idea as well. Which was what I figured. But when one is dealing with old gun stuff its wise to do some digging before concluding things.
Anyway I am going to tell the owner that is likely some private purchase thing. This does happen. I smuggled a Colt LW Commander to VN in my shaving kit and carried it in a X-15 shoulder holster.
https://www.milsurps.com/images/impo...56700071-1.jpg
https://www.milsurps.com/images/impo...35670023-1.jpg

So while neither were issue they were there carried by a Sp-4. Wish I had smuggled it home. But getting things back was harder than going over....

Quote:

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Originally Posted by 60gunner

But getting things back was harder than going over....

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And it wasn't worth time in Leavenworth...not after all the other.