Originally posted by disconnekt Yeah from what I've been able to find online, its the early model made by Tomioka Optical Co. (Info from here: RICOH (???)?XR RIKENON 35mm / f2.8??????PK???)
From your quoted website these are the telltale signs:
Early model: Tomioka Optical Co., Ltd., all-metal, minimum shooting distance 35cm, 6 aperture blades, minimum aperture value “f16”
Late type: Nitto Optical Co., Ltd., all-metal, minimum shooting distance 30cm, 5 diaphragm blades, minimum aperture value “f22”
Mind you, I asked goggle to translate the page.
My copy of the lens checks out as an early model - f16 + .35 meters at min distance.