SN 137xx... From prior Threads, though I was good on the grips. Now, sounds like they should have a gold medallion???
Being in the 13,700 range, yours should have the medallion stocks. Earlier Triple Lock revolvers assembled prior to mid 1910 have non medallion concave stocks. Your revolver has the later convex stocks that were never used on Triple Lock revolvers. You should be able to find a nice set of medallion stocks for $200 or less or maybe $250 If really nice. Then you have a set of convex stocks you can then sell.