It just occurred to me that "Bisley Matches" back in the day did not allow fully adjustable rear sights. We know very rare TLs were ordered from the factory with just a rear blade. Obviously the TL of this thread is not one of those because they will letter as such. But that may have been the reason for the change/removal of the adj rear sight. Although shortening the barrel seems to negate it as a competition gun.

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Jim
S&WCA #819