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My SAA 2nd gen. (SN 64304SA) barrel has marking "Co." with a line under the small "o". I have seen replacement barrels with the marking CO. (capital C & O) with no line under the "O". Is this a original Colt barrel? If so when did this change take place? THANKS
 

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Don Wilkerson's book states that the small "o" was used from 1972 to the end of production.

Rio
 
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