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 ※ The second photo was taken with a flash. ※ Overall, the surface has verdigris. (Photos 7-8 are easier to see) ※ There is distortion due to the metal (photo 9) ※ Accessories: None I will send it as is, just dusted off. Please check the photos and purchase only if you are satisfied.