If you measure it you will find the sight on your Model 10 is .100+/-. No post-WWII S&W had the 1/16" sight. The change to 1/8" was in 1961 with the 10-3.
The smooth trigger, at one time referred to as the "Texas Ranger" trigger, was introduced on a Texas Ranger commemorative Model 19 in 1973. The trigger was available from then on and could be purchased as a replacement part. There is no specific "dash" when it became standard for the Model 10.
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Gunsmithing since 1961
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