Vintage Museum of Fine Arts Kitty Pin

Lovely 3 cats on a ledge gold tone pin from the Museum of Fine Arts in Boston. Marked MFA, and there is another mark that looks like maybe "Angel" but I haven't been able to identify that one for sure. Unsure of the metal but it is pretty weighty for its size, and I have found another example that states it is 24k gold plated. 2" wide and 1.5" tall at the tallest.