Hello, I hope I'm not breaking any rules here by asking for help with this. I recently picked up this old brass lens of Yahoo Auctions for just about nothing with the intention of cleaning it up and tossing it on my Speed Graphic. I can't find any identifying marks, and it doesn't match any lenses I've seen. It looks like a rapid rectilinear design, but it's definitely not a Dallmeyer based on the design details. I haven't had a chance to really check focal length yet, but using the "compare the came object looking through two lenses method" I suspect it's about 300mm? I'm new to LF so I don't know a lot. Wondering if anyone has seen the same design elsewhere. Thank you!
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