I have an N frame pre war target with S&W rear sight with the two elevation screws that has the grooves above the hammer behind the blade and is unmodified. I also have a '2 screw' pre war factory rear sight only with the serial number 9639 stamped on the under side. It's an N frame length with grooves above the hammer behind the blade.
I have to look but I think I or my son may have another pre war target with grooved rear sight.
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Jim
S&WCA #819
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