164284 was a limited issue "Stocking Dealer Exclusive". These were special guns reserved for those S&W distributors that met certain contractual provisions. I've never seen a number published, but if I had to guess I'd say fewer than 400 were made.
In some respects it reminds me of the Mountain Gun concept. Except the 164284 has a heavier barrel profile. It's not super rare or astronomically valuable, but to a buyer that knows what it is, it probably carries a 10-20% premium over an otherwise identical Model 686-6.
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~ S&W aficionado in training ~
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