This is a T-ring for mounting a camera on any t-adpater. On the other side it says in white, friendly letters, "OM Japan." I thought I would show this side because you see more great metal working, and, well, the this pic came a lot better than the other side! In great looking condition. I also have an SCT rear-cell adpater-extender that accepts this ring, ad # 266773.
$12 + $3 shipping. Paypal, money order. Will ship worldwide.