A working Leica M3 with Summicron will easily cost from 15 to 25 times as much as that $35 K4a I was talking about. A working K4a is a tremendous value for anyone with the interest and patience to use it.
There has been talk about putting a Kiev/Contax mount optic onto an M3. Weren't the same Soviet era optics offered in M39? Wouldn't that go right onto an M3 with M39 adapter?