Marked on the bottom with the Webster Company logo. (and apparently on the rim by a strong toothed baby! 😂) It also is marked with sterling and an early pattern #4617. The pattern on the handle looks like oranges so it was probably meant as a juice cup - but, for baby’s health, DON’T use it for juice! It weighs 27.27 grams and is 1 3/4” tall, 3” wide at handle & 2 1/4” diameter. Note: last pic is from a different cup just to show Webster name w/logo.