Not much to go on with this one. "Found in a closet, no case, no markings whatsoever". Other than it looks like the slide is on backwards, the only marking I could discern from the pics is a "19" on the hand slide brace.

Anyone able to take a guess solely by the pics?
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Looks like an average student horn to me.

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Dunno for sure, but it has Martin qualities to it.

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