If you mean the exact same gun. I can't prove it, but I believe I did buy the same Dan Wesson 22 revolver twice. I had one years ago, traded it off, then bought another one that I believe was the same one. I'd lost my old records so I can't prove it, but some of the wear on the grip and a flaw in the finish looked familiar.
But if you just mean the same type gun, oh sure. I've done that a lot. S&W revolvers & Model 39 semi's, Colt 1911's, Ruger 10/22's, Single-Six's and standard 22 auto's, Marlin 336's in 30/30, and who knows what else.
I'm sure I'll do it agin.