I picked up a pair of 64-6, 4", DAO, marked CAI at the muzzle, from my LGS at a bargain basement price. I almost got a pair back when J&G was selling them. I heard that condition was really spotty. I picked through a stack to find the two that I have. I got 2 hammers from Smith and have a pair of great shooters for less than $275 apiece. They are both round butt, so I have hopes of installing 3" barrels someday.
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I don't have Alzheimer's- My wife had me tested.