I made a mistake early this year when a seller had half a dozen f2 Jupiter 8 lenses all LTM fit, I picked two for a Zorki C I'd bought for 5 previously from the same seller and to replace an Industar on a Fed. They were 10 each way under the usual ebay price and in excellent condition, one looked unused. Mr Rock (Rocky Cameras) and another dealer snapped them up.

Ian