Several reputable dealers come to mind, and I'm certainly leaving out lots of smaller guys who have stellar reputations.
Try Simpson, Ltd. in Galesburg, IL, and also Legacy Collectables. They both have websites which can be quite informative just to browse.
I'm not aware of specific markings on SS holsters, so that may have been a soldier's add-on feature to add to the curb appeal.
Good luck and keep us posted of your progress. And you may well hear from forum members regarding suggestions or specific guns. Overall a trustworthy bunch.
dju
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