The 50mm challenge - it is worth a try

Hi guys, i will start in next few days a challenge of the really old and cheap 50mm lenses. Do you lie in your showcase even such old baby around? Then send the items to me so I can try them. The more the merrier.  For starters, all of Minolta MD, Canon FD, M39 or Nikon Ai (S) would be a great thing. I know there are also a lot of M42, but the right adapter I have not yet here. I'll try the lenses on APS-C and full frame test on. I just need cheap Sony a7; o)