Howdy
I only have two actual Model 10s. Both are Model 10-5. Both have 4 inch barrels. Both made around 1964 or so.
The revolver at the bottom of this photo is my other Model 10. Best deal I ever got on a S&W, $125 out the door. Of course that was probably close to 20 years ago. Still missing from my collection is a Model 10 with a tapered six inch barrel. The revolver at the top of the photo is a 38 Military and Police 4th Change, the direct predecessor of the Model 10. This one left the factory in 1938. Notice the different hammer and front sight profiles.
Let's take a trip down memory lane. The original 38 Military and Police, the Model of 1899 Army-Navy Revolver. This one shipped in 1899. Notice the lack of an under barrel latch for the front of the ejector rod. The only 38 M&P without that feature.
38 M&P 1st Change, 1906. Note the large mushroom shaped cap at the end of the ejector rod. Notice in addition to 38 Special, this one is also marked for the U.S. Service Cartridge (38 Long Colt)
This one is chambered for the 32WCF (32-20) cartridge. So it is a 32-20 Hand Ejector, from 1916.
A 38 M&P Target Model from 1917. This is the predecessor of the K-38, and the Model 14. Notice the tall front sight and the teeny windage adjustment screw in the rear sight.
A 38 M&P from 1920. Very worn on the outside, but with a little cleanup inside it locks up and shoots as well as the day it left the factory.
One of my favorites, a 38 M&P with round butt from 1939. Note the hard rubber grips.
A 38 M&P snubby with a 2" barrel from 1950. Note the 'speed hammer'.