If it's a 1946 produced gun, it's not a model 10. It's a Model 1905 Military & Police Hand Ejector, 4th model. Model numbers were not used until 1957, when the Model 1905 M&P Hand Ejector became the model 10. If it is really a 1946 produced gun, it could be interesting as this production period had many guns that were "transitional" in that they were using up left over parts from Pre-WW2 supplies mixed with newer design modifications, giving us collectors some nice variations to look for. The hammer is one of those variations, so be sure you match your old hammer to any new one you buy to be sure you are getting the style for your gun's action, or the new hammer won't function. Ed.