I kinda like M10's and M&P's. Some years back I set about trying to get the assortment of barrel lengths commonly found on them.
Most of these were well under $300. Think I did pay the most, $450 for the M&P 2" SB, c.1954. It's nearly perfect. The 3" is a bit odd - although not 'lettered', a communication with S&W Historian Roy Jinks showed it shipped in 1958, and is not model-marked, so it's an M&P.
It came into an LGS I was working p/t at. A young man had inherited it and traded it in on a Glock. Boss/owner made me shell out $150 for it!
Anyway, some also-rans off to the left side - a Victory Model, c.1942 and an Hand Ejector (4th change?) 4" RB with near perfect large-medallion grips on it, c.1929 IIRC.
It was fun.