The product code for the CSP guns was 100728. AYY s/n's. The two I've seen both had a ship date of August 10, 1988.
They're pretty plain Jane looking. No emblems or engraving. No numbers or anything about Connecticut. Matte blue like the OP states.
I'd value one in the $600 to $750 range in the condition the OP states. Maybe a bit more for an original box and/or presentation case. A really neat Magnum K-frame.
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~ S&W aficionado in training ~
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