Mexico. Gold Medal, 1957. Grove-698; KM-M122a. 41.2 grams. 37 mm. Mint issue. Centennial of the Constitution. A standing feminine figure with a book. In the background is a map of Mexico and the radiant sun. Reverse; The interior of the Chamber of Deputies. Edge bruise. About Uncirculated. Estimate Value $1,250 - 1,350