Interesting. Thanks for all the replies. Good to know it's not Pentax. I'll try and return the lens.

Hello Pentaxians!

I recently ordered a used zoom lens and I can't mount it to my camera (Pentax K1). The lens is an old Sigma APO 75-300 f4-5. It has a plastic flange (or something) extending past the mount base plate (as pictured). The plastic over-lap will not allow the lens to make full contact with the camera. I'm will likely just file the plastic down, but I thought I would consult professional advise first . Any help would be much appreciated. Thanks, Rick

Hey John, Yep there it is.. So it's the Ricoh customization program. Thank you very much for the lead.

Hello Pentax Users,

I'm a life long Pentax user and joined this site about a year ago. I haven't been on in months and the photos I've uploaded and my profile appear to be gone..
Anywho, I posting this message to see if anyone can help me identify this camera. I recently purchased a Ricoh GR from Japan. I've been wanting a GR and came across this unique version and took a chance ordering it. It was listed as a limited (or special) version. However, it's not the green and black limited edition I'm familiar with. My camera is black with a brown (or ox blood) wood grip. The wood has a distinct burl or tortoise shell look. It also appears to be a Ricoh GR I (it doesn't have wifi). In doing research I've found some rare limited editions (like a blue one), but none like the one I recently purchased. Fortunately, the camera is working very well - so I don't think it's a knock-off. Any input you might have will be much appreciated. Thanks, Rick