Engraved infinity knot 10k solid yellow gold watch charm hook lapel pin brooch

This engraved infinity knot 10k solid yellow gold watch charm hook lapel pin / brooch is in excellent vintage condition. The clasp works now but this type of clasp often can wear to a point of not clicking in place although with the pressure from the clothing it is pined to will hold the needle in the curved part of the clasp anyway. It is marked - 10k & weighs - 2.02 grams & measures approx. - 1 x 7/8 inches. I see no maker's mark.
I believe it was produced in the 1930's - 1940's.
Questions welcome.