I would guess it is a korean made colt copy. I used to own one, but sold it. If you are a Napca member there was a write up by John J and myself on the two we each owned. We guessed they were made in the 1950's, but that is just a guess. Johns was NC marked, instead of No like yours.
Reportedly only 500 of these were made in the Pusan area; here is a picture of the one I used to own.
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