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Hope this isn't breaking any rules, but I'm intrigued by this funny looking lens on ebay. I've asked the seller what it is but he says the only lettering on it is Tele Rikenon Lens, Made In Japan, 16875. I suppose the number is probably a serial number? I have a Spotmatic and a Ricoh KR-10 so I probably could use this lens...if it works...and if it's really a lens. What the hell is it???
RIKENON, Ricoh Telephoto Lense. 16875. Collectors | eBay