Hi Erik, eh eh, me too noticed that strange different bottom ring in Lager's book... oh well... too a little difference to justify a difficult (and maybe
costly) chase...
The M2 version... well I passed by an item, seem...10 or 12 years ago: stupid, I never saw another for sale... I didn't remember its look: really was an alu body ? similar to the 2,8 ? Ugly... What is funny is that in the M2 version one of the engravings on the front is upside-down respect to the other 3,5s... i.e., both the "Summaron..." and the "Ernst Leitz..." engravings have the same orientation. If you are so lucky to find TWO in New Zealand... well, the worst is for me...
send me a PM...