I gave up. I'm glad you put up a picture of the entire item. Sometimes the workmanship will lead you to the maker. From what I find it seems they refer this type of work in silver as "Aztec" for that calender. I believe this stuff may come from Mexico City, but that's only a guess. I've seen belt buckles, money clips, and other personal silver pieces made with this type engraved workmanship. Good luck on selling it!
What id the writing above the crown? Too blurry to see when blown up. I can't tell if it's a name or several letters and "925" or what. It's definitely not an Antonio crown.