Wore on off for about 10 months. Threader post. Back screws on.. stamped 535. Oxidized on the post but cleaned and screws perfectly etc Detailed as hell! No longer sold. Love this piece but needs new home as I’m closing up my second ear hole. Retail store called Rowan. near Catbird, Mejuri, Pamela Love, Bario Neal etc. See Catbird packaging in last pic- lmk if you want anything I’ll do my best to accommodate:-)! Bundle & save thanks!