Hello!
To Vlad: All the serial #s of S are mixed with regular ones. The first true # I know for S is 56041, the last one 181306. So, an early S would be a type c from 1938 (c. 55000 to c. 95000). But it's only an opinion.
And thanks for that fascinating site!
To Aida: I have registered only four rigid macro lenses with #: from 12075 to 15136, mine is 14568. Non numbered seem to be more numerous, and one seller told me that these ones had been made in 1949, another one in 1950-51. Nothing sure!
To Bill: special thanks to you: your site always makes me dream...
Very happy you share my opinion about the 1/1000th shutters passing through WW2 to be mounted on Berdsks and Fed-Zorkis.
To Luis: A fine 2/50 Leica like lens! These lenses seem to be quite rare. I only know three of them.
Mine has a black front written "Summar 1/2 f=5cm N°690233 Ernst Leitz Wetzlar". This lens (stamped 21488/105 at the rear) is no doubt a prewar. As the front # corresponds to a real 1949 Leica lens, I think it was converted that same year.
About the # of 2/50 lenses: there is something strange. In the range 30000-33000, I find six 2/50
and four 6,3/100mm. As if 2/50 lenses had been lacking and an extra lot had been made, using partially the serial numbers given to the tele.
The other extra lenses have their own range which doesn't mix with an other.
Amicalement.

Jacques.