An OM System round Eyecup 1 from my own OM collection. It is comprised of the viewfinder coupler, round rubber cup and the removable threaded ring that secures diopter correcting lenses available separately (no lenses included).
All is in excellent, carefully used condition-the coupler fits securely to the camera, the cup has no cuts, tears or perishing, the lens securing ring thread is smooth and easy to remove & fit.