My RSR 6592 that I picked up a couple years ago. This is the best shooting gun I have ever had. Never misfires and shoots like a dream.
From the Standard Catalog of Smith and Wesson I found this information. The Catalog does not mention the 6453 but I have seen at least one on this website.
Models SN Start SN End Manufactured
6450 1 177 177 Ajustable rear site, RR front
6451 178 407 230 Fixed rear site, RR front
6452 408 619 212 3 dot fixed sights
6453 ? ? ?
4690 1001 1293 293 3 dot fixed sights
4691 1294 1469 153 red ramp front site
6590 2001 2741 741 3 dot sites removable barrel bushing
6591 2742 3110 369 RR fixed sights removable barrel bushing
6592 3111 3359 249 3 dot sites fixed barrel bushing
6690 4001 4853 853 RR fixed sights
6691 4854 4946 93 white dot fixed sights
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6944, 6592 RSR, 1006
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