I just bought this lens, I still have to get my hands on it
it was made by Hermagis Paris, it's an "Extra Rapide" no.4
it should be a portrait lens (petzval?)
it has a diaphgram iris with aperture range from 3.5 to 20
the barrel diameter is about 9 cm and about 20 cm tall
it comes with a mounting flange and a hood (about 10 cm diameter)
I didn't find any information on this lens on the web... how old do you think it is and which image circle do you think it covers?
I will probably answer the latter question myself once I have the lens here, but I would still like to know more about the lens, I'm not an expert, but was looking for a very old portrait lens... I hope it will cover the 5x7 format and hopefully full plate or 8x10