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I've seen two so far. One at a gun show perhaps a year ago (mismatched and somewhat beat up but still a shooter), and another on the EE also in fair condition. It seems when these turn up, they are gone like hot cakes.
Nice collection! If I am right, you can usually spot a 937a by the front sight "ears". They also have the bottom sling arrangement compared to the familiar side sling set up of the Kar98.