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· Gold Bullet Member
1,366 Posts
Hi CosmicCharlie24 :

Sometime in the 10 to 20,000 range production went to the "B" stock without the drain holes, some of these stocks had the Kokura or Jinsen proofs. Not enough early rifles have been reported or chartered to tell for sure when the markings changed.
Thanks again Victor - with the Ko and se and no unique Jinsen marks I guess there is nothing to differentiate it from a Kokura stock.
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