Genuine ABU parts, a casting control knob and two adjustment washers for a bait reel. Part number: 10239 I believe it was chrome-plated on a brass base. Mechanical brake cap? I don't know the official name. I purchased it new as a genuine part and used it on a 2500C. It is in good condition with no noticeable scratches or deterioration of the plating. Please judge the details from the photos. Returns are not accepted. Old tackle Old reel ABU Ambassador Avail Valley Hill