I was going to say I have sold two identical key chains with the "return to tiffany" heart tags that had these same markings. I actually dug one of them at the beach, shown below. I know they make these with different tags and different marks also, sterling vs 925, some of them are dated I believe also near the marks.I don’t have the piece in front of me but I’d say with 99% confidence that it’s real. I specialize in Tiffany identification for the retail end of our little precious metals operation. You can read my article - just google fake tiffany bracelet and it will come up in the first few hits - hunter ridge jewelry