Found gold-tone Hamilton pocket watch

I found a gold-tone Hamilton pocket watch with a delicate chain yesterday around 3pm outside a cafe on Lincoln Road at Meridian Ave in South Beach. It’s a vintage-looking piece, about the size of a large coin, with a black dial and Roman numerals, and a tiny red enamel heart charm dangling from the chain. On the back there’s an engraving that reads 'M. Rivera 1962,' and it sits in a worn black leather pouch with faded red lining. This feels like a sentimental keepsake, and I’d love to return it to its owner—if you recognize these details, tell me the inscription or the pouch color and I’ll help reunite you.