Probably actually a 10-7, dating to late 1984 or so. Doesn't sound as if there's anything too remarkable about it. I'd hold out for another early gun more like that nickeled one you previously posted about, M&P's just a few years newer than that one (in the lower "C" prefix seral number range) can also be found in the snubnose configuration.
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SWCA #590
"Colligo ergo sum"
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