I have a matching sugar bowl and cream pitcher marked “Sheffield, Made in US” under a rising sun (with lots of rays). Under that are 5 tiny square (?) marks (might be M, B, D, E, N in fancy script).
Both are 4″ high. The widest reach of the handles is 5″ across. No Googling has revealed a US maker (reproducer?) of “Sheffield” designs that used a sunshine logo as its mark. Suggestions are welcome!
The marks are at the bottom of a hole in the base that is less than 1/2 inches wide. I was barely able to discern it with the aid of a strong magnifying glass and lots of light. My camera won’t take a readable image of it, which is why I described it in words.