The numbers are:īy the way, this is a pre-WHS model and the text is written "upside down" compared with other versions of this lens and the signs of the radial drive attachment have been completely removed when a later WHS was made in the sleeve. I see no connection with dates, but perhaps it relates to the single lens going into the Petzval or an internal stockbook of parts.
It looks to me like Hermagis decided to start engraving numbers and decided to start at what they considered to accumulated numbers made to that date (or at a number that customers could accept as being realistic!). While checking the other earlier serial numbered Hermagis I find mine is the lowest number. They were both on the achromat (2 numbers) and the thick concave (1 number). 7242, which was originally a Convertible Petzval, I note a distinct variation from the numbers and signature styles already listed here.
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