I show S167222 as a .44 Magnum with a 6 1/2" barrel that shipped in August, 1956. I also show a .44 Magnum 6 1/2" with serial number S178003 shipping in November, 1957. So I believe the one you are looking at might be a little bit earlier than you think. Of course, they did not ship in serial order, so S1696xx could have shipped later. But at least that gives you a ballpark date.

Personally, I think the price is a bit high, considering your description of the condition. For that money, I think you can do better.

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Jack
SWCA #2475, SWHF #318