I'm working on this Sessions black mantel, looks like a Winchester, from 1921 in Tran's book. It has Lion heads on the side instead of what's shown from the catlaog picture. Has the Successors to E. N. Welch label often seen. The unusual thing is the stamp on the back plate of the movement. A large C with an E in the middle. Looks professionally done. Anyone seen anything like this? The movement is trademarked Sessions, likely original to the clock.