Vintage pin/pendant with love note inside

This vintage pin also has a top loop to be a pendant. It’s shaped as an envelope with a copper note inside which says “I love you” This is a vintage piece showing signs of use & wear including some scratches. Back pin has visible glue holding it on pendant (see all pics) Approx measurements : 1.25 in x .75 in Unsure of metal….could be brass or copper I think New to Poshmark? Use my code BANANARAMA1001 when you sign up for $15 off your first purchase