A Model 10 with serial number C434530 is very likely a 1959-shipped gun. It should be model-marked in the yoke area. If it shipped as early as late 1958, which, as Linde mentioned, is possible, it should still be late enough to have a model number on it. Most likely it will be simply a Model 10 with no dash number.
It is easy enough for you to find out. Just open the cylinder and look.
And, by the way, the Model 10 did not appear on the scene until 1958, after the management decision in the summer of 1957 to assign model numbers to the hand ejector revolvers. It has an
ancestry that goes back to 1899, but the configuration that finally became the Model 10 only dates to 1948. Nothing before 1948 is even a "pre-model 10" if you want to use that anachronistic nomenclature. In the early days, it was called the Military Model, then the Model of 1905 and then the .38 Military & Police. That latter name was used until the model number was added to it in 1957, when it became the Model 10 Military & Police revolver.
Thus ends my brief history of this line of revolvers . . .
