From features, I think your M&P target would have shipped between 1923 and 1927.

I get a seriously early vibe from your K-38; that target hammer and those target stocks are not known on guns that shipped before 1950. I suspect there may be undiscovered guns in that configuration that shipped in very late 1949, but I haven't found one yet or -- equally likely -- found one once and then forgot about it. If the gun angel sitting on my shoulder is telling me true , I would guess your serial number there is in the K77000-K81000 range and that the revolver dates to the first months of 1950. But the gun angel has been known to horse me around, so I could be low.

The serial number on your M&P Target is likely to start with a 4 or a 5.

If you don't want to disclose serial numbers precisely, please consider using XX in place of the last two digits. That's enough to help us narrow their date range.

Nice guns both. And welcome to the forum.

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David Wilson