The guy who used to run Cambridge Camera Exchange, long known as one of the worst NY camera dealer, sold his own brand of cameras. The Cambron cameras were rebadged Zenits, they were the cheapest camera you could buy, $99 with the Helios 58/2.
Then he had his "high end" camera, the Lindenblatt KL-2. This was a Topcon K-mount camera that was never sold by Topcon, Topcon AM-1. It was released in 1983 by Cima as the Cimko LS-1, and in the US as the Lindenblatt. If you look at the Cambridge ads in old magazines you'll see that he priced them almost as much as a Pentax LX...
Apparently he still has some in stock, because he's still trying to sell them "open box" on eBay...for $399...
LINDENBLATT KL2 35mm SLR CAMERA BLACK with PENTAX K MOUNT BAYONET LENS MOUNT NEW | eBay
He sells the manual for the low low price of just $19.99...