I have got last week very interesting Zorki-5 (1st type) with colorless engraving. It seems to be never colored. The engraving is also shifted a bit in comparison with the red one. Any ideas?
http://www.ussrphoto.com/UserContent/1262016_20160612_0063.JPG
http://www.ussrphoto.com/UserContent/1262016_20160612_0064.JPG
Regards, Alexander