please help with maker's mark

[purple73z]

i have a pretty pin/brooch with a maker's mark that i cant identify. It is: plata (over the top) 925, on the bottom of the circle it has, guan jal, mex. the letters MRM are in the center it also has the eagle with a 1. I understand the 1 in the eagle stands for mexico city and is in the style that started being used in 1955. Any help identifying the artist would be most appreciated.

Thank You,
purple73z
Kim[/img]

[Karina]

Hello Purple73z, I have a pendant with that exact mark. I would also like to know who the artist was, have you found anything on it yet?