Sterling silver vintage heart locket

Beautiful, vintage heart locket with unique ridged design. 925 stamp and "SU" in small circle. From research the SU indicates sterling silver or may be a distributor stamp. "Thailand" stamp on other side. ~5g Needs polishing, has imperfections as seen in photos, especially the dark lines, but I think it really adds to the vintage character and makes it more unique! No trades, offers welcome. Bundle for a discount!