Thanks for helping with this …

Also, I appreciate the explanation regarding the numbers.

The backstamp appears to be made from an actual stamp. It is not impressed or raised.

I suspect the tea set was made by nuns who ran a spiritual health spa in Rome City called Sylvan Springs from about 1910 until 1970. It was purchased in the 1930s.

The number that is different on each piece would be the mold number !! The 1081 if the same on all items would be the pattern number !! I can find no pottery that used that backstamp !! It it impressed or raised on the bottom or stamped ??

Sorry, should have explained that. The red text are numbers. The top number is 1081, which I believe is the lot number. The bottom number (e.g., 55) is different on each piece, so it is likely an item number.

What is written in red ??