Likely from the 1970s-80s. The seashells around the face sparkle and are impressive. (Personal impression) Total diameter: Approximately 280mm Thickness: Approximately 10mm Calendar section diameter: Approximately 160mm Weight: Approximately 660g Back engraving: MEXICO ※Photo 2 was taken with a flash ※Verdigris is present overall on the surface (Photos 7-8 are easier to see) ※There is distortion due to the metal (Photo 9) ※Accessories: None I will send it as is, after only dusting it off. Please check the photos and purchase only if you are satisfied.