Does anyone here know when approximately B&L Tessars stopped being marked with the Zeiss name? I have heard prior to WWI but am not sure how accurate that information is. I've also heard that the serial # blocks used were all over the place and lenses in the 2,000,000 range have been found from the 30's-40's and others from much earlier. I'm looking at a 5x7 1c which I believe to be 190mm base on this chart. http://www.allenrumme.com/lensdb/Bau...and%20Lomb.htm The exact lens I'm looking at is marked "5x7 Bausch & Lomb Zeiss-Tessar Series 1c." The serial number is 1,413,573 which according to some unnoficial B&L serial # charts I've found is way beyond any recorded range before they went to the lettering system. According to another source the Zeiss-Tessar marking was dropped when Zeiss stopped licensing the Tessar design to B&L sometime prior to WWI. Just kind of curious how old this lens may be. Thanks in advance for any info.
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