Turquoise & Coral Belt Buckle

We have had this Navajo buckle since the late 1980's when it was originally pawned. It remained in pawn until the early 90's when we closed that particular store. The buckle is 3.25" long and 2.5" wide and will fit a belt width of 1.5". Artist mark is A M but because of it's age we are not confidant in who made it.