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square
Your Smith and Wesson model 13-1 will have a 3in.Barrel if it is a round butt,or a 4in.Barrel if it is a square Butt model revolver.
Depends on when it was made.
round
Standard Catalog of Smith and Wesson, 3rd, ed., Supica and Nahas
Need the serial number.
Read the one on the butt.
Serial Number on the butt.
50-500 usd
$250-$350 depending on condition
1970
On the butt and in the crane area.