Howdy
You would be hard pressed to find a Model 10 for $300 in these parts. I only paid $125 for this 10-5, but that was quite a few years ago at this point.
Model 10s seem to be running around $450 - $500 in these parts these days.
Just checked on line at the biggest gun room in New England, seems there is a Model 10-6 for $400 and a 38 Military and Police for $525, but I have no idea what their condition is.
I actually only own two Model 10s, but I have a bunch of their predecessors, the 38 Military and Police.
This one is from the 1920s.
This one shipped in June of 1939. Love the round grip frame and the hard rubber grips.
This one shipped in March of 1950.
This is a pretty early one, it shipped in July of 1908.
Then there is the 38 M&P Target model, the predecessor to the K-38, and that was in turn the predecessor to the Model 14. This one shipped in February of 1917. Check out the tiny adjustment screw on the rear sight.
I'd post more but we can only attach six photos to each post.