I think a revolver being the classic for its maker is the one most sought after by shooters and collectors and with the S&W or Colt and not necessarily the first. So for me in the S&W line it's the Model 27 starting with the registered magnum followed in second by the Model 29. In colts I think it's the Python and the in second is the Diamondback. In both lines I think the first and second models in each are the most sought after and cost the most.