Originally Posted by
goamules
I have a couple thoughts. First, as you said there is no track on the inner barrel, yet a tangent focus knob was on the outer, I'd say the internal parts are not original to the sleeve. They could be Derogy, or anything else that happened to fit in the Derogy barrel. I'll relate another thought with a story; once I bought a nice "original" Darlot pillbox lens. Being a simple meniscus, I just flipped it over to confirm glass was in the rear, when inspecting at the vendor's table. I was overseas, and put it in my suitcase until I got home. On closer inspection, someone had taken the original meniscus out, and replaced the rear with an air-spaced set from a petzval, that happened to screw in nicely. The lens was useless. When you have a 100 year old lens, which are easy to unscrew and misconfigure, sometimes you get something that isn't correct or original. Of course, if you flip one of the lenses around, it looks like a rapid rectilinear, depending on the curves.
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