Magnificent example of antique american coin silver. 
Truly collectors grade.
Coin silver wine or water goblet - cup. 
Made by gorham, one of the finest american silver company, circa 1850's.
Superb hand engraved decoration.
Marked under the base with set of gorham silver hallmarks, #15. Guaranteed solid silver: 900/1000 american coin silver standard (coin silver standard is slightly lower the sterling). Also scratched with numbers under the base.
   size:
About 6 1/2 in. High. 
   weight:
About 6.4 troy oz. - 199 grams, feels heavy for the size.
  condition:
Very good original antique condition, shows minor normal wear, light handling marks and expected charming indication of age. 
Crisp hand engraved details, item was never polished on polishing wheel.
All dark spots you are seeing in the pictures is just a reflection.