Welcome to the par-teh!
You're among the blessed "few."
I've a 4690, 6590, 6591, 6592 and 6690 (2 ea.).
According to the Standard Catalog of Smith and Wesson, No. 4 (SCSW4), Page 387, "Our understanding of these models is incomplete" and continues with naming 10 RSR (S&W firearms distributor) models that were apparently produced at the behest of RSR but for reasons that, for now, seem lost in the fog of time.
Although the reasons subjectively provided are apparently as numerous as, ahem, the rear ends (including this one) providing such, the 10 models have features that span two generations, e.g.: a 459 frame with 5904 slide or guts or mix and match.
As S&W transitioned to its third-generation semi-automatics - and coincidentally also expanding the number of model lines - it also changed the nomenclatura (I just love that word; most say "nomenclature") so that a 459 became a 5904; a 469 became a 6904 and etc.
Thus the reason you've got a product code that's, well, a little confused.
The number of exact guns produced under the circumstances as yours (and mine) are unclear (which really isn't that unusual for S&W) but, clearly, it's unlikely there were many.
You've got a keeper and, as previously noted, welcome to the club.
Later.
|