04/03/2010 22:12
Hi Ulrich,
In Albino Pegorari's and Claudio Asquini's little booklet of Zorki classifications and characteristics there are two groups of Zorki which they classify as "Zorki 1 C1 & 1 C1A" and "Zorki 1 D1 & D1A" which have the serial numbers in upright figures on the back.
These are listed as 1951 - 1953 and serial numbers (approximately) N. 138,000 to 425,000 (maybe only some unknown amount of cameras in the middle of these series have the upright figures ... the exact serial numbers of this type of engraving is not specified). Before and after have italic numbers. These cameras have the Cyrillic script and also Roman English logo engraving (usually referred to as "Zorki-Zorki" or "Export engraving".
I'm not sure from personal experience, but mostly their books seem to be correct in the details and are learned from their own personal collecting experience.
Regards, Bill