Hi,
Really looks like TANE (mark on the right).
TANE ORFEVRES in Mexico City since 1950s. If the mark on the left is JMS, then it is attributed (possibly) to silversmith José Marmolejo.
Regards
I like the responses. My opinion. Jose Marmolejo and Tane was specific to eagle 1. This reads to me as eagle 32. It seems they didn't stamp it straight and the T didn't show up well.
My 2 cents is obvious Tane, eagle 32, UMS would be an unknown maker. Tane used many artists.
Beautiful piece.