A couple of years ago I bought this lens at Bièvres Foire Photo. It is a Petzval type that follows exactly the lens design we find in Kingslake's book (History ...): a front cemented doublet and a rear air spaced doublet. Even the thickness and relative surface radius match the scheme. But the serial number is 46559, that points to a very late production of a very old design. Lenses diameter is 80 mm (all the same) . Does anybody know the manufacturing year for this lens? and/or provide any info about it, like advertising, listing in sales catalogue... whatever.

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