I've been searching for help with these marks on a tea pot

I’m having trouble identifying these marks on a tea pot I have. I’m hoping someone one can help me or point me in the right direction. I have many tea pots, trays and some with it’s matching set; all are either sterling or silver plated.
This particular tea pot, I have 2 of these pots and their matching cream and sugar pots. The marks are located on the inside of each leg. These markers have yet to come up in my research. I appreciate any help with this guy and any tips someone may have.

I’m trying to upload the pic. But the marks are “B”, “K”, “S” looking symbol and a “1”

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