I am looking for a Summicron 50 F2 - the one that has the tabbed focusing. It was made from 1979 - 1994 I believe. The version before the internal hood was included.
This was a beautiful curved wide tab that your finger-tip could fit into. They don't make them like they used to!! Ask me how many times I've kicked myself for getting rid of my flat-out gorgeous 1967 Leica M4 w/6 new lenses!!