Thanks to anyone who can help me out here.
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Learn about rec.guns at http://www.recguns.net
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The 15-1 started in 1959 with a change to LH extractor rod thread
The 15-2 started in 1961 with the cylinder stop changed, and hole in
front of trigger guard eliminated
Source http://www.handloads.com/misc/Smith.Model.Changes.asp
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Learn about rec.guns at http://www.recguns.net
Win an M1 Garand from Fulton Armory while helping the Cause!
Details of the MPFO rifle raffle are at http://myguns.org/
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A fella might ask over here http://smith-wessonforum.com/
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Learn about rec.guns at http://www.recguns.net