Just bought a teapot at a thrift store and I can not find any info on the mark! It's a small crest with a lion on hindlegs on each side. In the crest are a Large F with a smaller S on the left and Co on the right. Underneath it reads E.P.C., which I understand is Electro Plated Copper. Below the EPC is the number 159.
Sorry I can't post a pic. Hope someone out there can help!
Thanks!