I have a large Voigtlander lens serial number 24257 (1878 or so?). It has two elements cemented in the front and two air spaced elements in the back - so I said "Aha, a petzval". Then a noticed a number 7 engraved on the barrel and I got suspicious. Could it be a Euryscope? But, when I unscrewed the rear elements, they were not a petzval configuration or a Euryscope. They looked a lot like my Dallmeyer portrait lens where I can unscrew the back to change the softness. I can't find any Voigtlander Diagrams that show this configuration. Am I missing something basic? Picture of lens and rear element below. Any help would be appreciated.
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