It was my husbands great-great grandmothers. It would make since that it has little wear, as it came off a display trunk that she had decorating one of her guest bedrooms. She was from Spanish decent. I only took a picture of the top and then used a magnifying glass on the mark to try and get a good photo. We had it professionally tested and it is Sterling Silver through and through. The bolts on the hinges do have wear and some corrosion. I figured it was Spanish Colonial and my search took me to the site you listed above, but they only talk about the bird and LN/CIN hallmark, not anything on the Hercules Pillars and Two Hemispheres with the Crown. I know that it is the reverse of the Mexican Reales, I just didn't know if anyone would know what that mark was associated with when it came to Sterling Items vs Coins.