Leica Leicaflex
Elmarit-R
1:2.8/180mm
11919
3-cam for Leica R and Leicaflex SL
Original box packing lens hood(12509) front cap(14172) back cap(14162)
Purchased 11/22/1972
Mint condition

I have not cleaned, dusted or touched any lenses. Instead I've taken the advice of Photo.net - "Better not to clean at all than get it wrong."