What is the difference, date of manufacture or other, of lenses engraved Taylor-Hobson Wide Angle Anastigmat Series VIIB and Cooke Wide Angle Anastigmat Series VIIB respectively ? I have a 6 1/4" and a 4 1/4 both in shutters so there is no serial number visible. I also have a 5 1/4 "Cooke" in barrel curiously engraved f/6,3 manufactured in the 50-ies if I remember Barbara's helpful answer to my query. By the way are there any rumors regarding the Series VIIC as yet, I have not had access to a computer for a period ?
Cheers, Richard
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