OK, here's a real
Find me a set of two lenses: 50mm and 35mm.
Both must be in LTM (leica thread/screw mount a.k.a. M39). They must share the same filter size AND the same lens shade. The lens shade must be of the twist-on or snap-on type; not
one that screws into the filter thread. Both lenses must have aperture click-stops (as opposed to the Jupiter-8, for instance).
Each lens must be faster than f/2. They must be sharp (hi-res) by today's standards, and extremely flare-resistant when shooting a backlit scene. They must have enough aperture blades to yield pleasant bokeh.
Even with all the equipment I will be selling to fund these lenses, price is still a significant consideration. As a general guideline, $300 per lens would be painful, but possible. A battered lens barrel is not a problem, so long as the optics and mechanics are flawless.
If anyone manages to squeeze any serious recommendations into these tight guidelines, I'll be quite impressed. Thanks in advance, eh?