Caught the Topcon bug when I first purchased a fixed lens 4.4CM/F2 35-L rangefinder camera which I used extensively on a trip to CA. Great images from that lens which spurred me on to acquire the full gamut of Topcor lenses, made primarily for the Leotax line-up of interchangeable lens rangefinders. I acquired by luck, a 5cm/F1.5 Topcor, which I used for a bit, but resold after I had acquired a 5CM/F2 which I found very similar and made a nice profit on the F/1.5. Eventually through the next 10 years, I have accumulated the 35/F2.8, the 135/3.5, and most recently the 90/F3.5. Oh, and along the way stubbled upon a 5CM/F2.8 which is probably the rarest of all.
Have a nice RE Super and a few lenses but value the Topcors for LTM even more.
Such great products but very little information about the company other than the short synopsis on Camerapedia. Maybe this topic is just a dead end street after so many years since they went out of the camera business. You would think that the current Topcon company would be interested in their historical background, but doesn't seem terribly so? I guess that's why I was a History major in college!