S&W builds a new gun and they give it a model number, ie: Model 29 or Model 686. As they make running production changes in spec's over the years, they give it a "dash number", ie: Model 29-4 or Model 686-6. So, if someone says their Model 29 is a "no dash", they're telling you that it is an early production gun.
"No dash" S&W means early production gun? Not always. If the model didn't undergo an subsequent design changes from its original-production configuration, the model number may have remained exactly the same for years & years. The number after the dash is simply an indicator of which different configuration you've got.
The Model 10 has been in production since 1957, and before that it was known as the "Military and Police".
1957: Begin stamping model number.
10-1 (1959): introduction of heavy barrel (the frame is slightly different for the heavy barrel, and changes to the standard-barrel variant were generally carried over to the heavy-barrel variant, thus the engineering changes happen in pairs)
10-2 (1961): change extractor rod thread for standard barrel
10-3 (1961): change extractor rod thread for heavy barrel, change front sight width from 1/10" to 1/8"
10-4 (1962): eliminate trigger-guard screw on standard barrel frame
10-5 (1962): change sight width from 1/10" to 1/8" for standard barrel
10-6 (1962): eliminate trigger-guard screw on heavy-barrel frame
10-7 (1977): change gas ring from yoke to cylinder for standard barrel
10-8 (1977): change gas ring from yoke to cylinder for heavy barrel
10-9 (1988): new yoke retention system, radius stud package, floating hand hammer nose bushing for standard barrel
10-10 (1988): new yoke retention system, radius stud package, floating hand hammer nose bushing for heavy barrel
10-11 (1997): MIM hammer/trigger + floating firing pin for standard barrel
10-12 (1997): MIM hammer/trigger + floating firing pin for heavy barrel
10-13 (2002): limited production 1899 commemorative edition
10-14 (2002): internal lock
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