Now, the last 3 digit will tell you even closer.

From the Std Catalog of S&W

C405,019 – C429,740…..1958 – 59
C429,741 – C474,148…….1960

In my opinion, Model 10's have defended more people than any other handgun in history.

They are the cornerstone of revolvers and as reliable as one too!

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Take your time..quickly.