Topcon was made in somewhat smaller numbers and despite have several advantages over the Nikon F it is limited in it's appeal. The expectation is the Topcon Super Re and DM with U.S Navy engraved on the body. Although the Miranda Orion is very collectable the other models have not held up all that well and are not sought after. The K1000, Spotmatic, Pentax LX, Minolta X700, and Canon F1 to name a few are being bought for use, not so much for collection. Swiss Alpa 35mm were very collectable, but prices seemed to have dropped, the Kern Swiss 50 1.7 Macro is holding it's own. Even Leica SLs are not going for very high prices while the lens are still expensive.