Help needed with one (last) maker's mark on napkin ring.

[jangerd]

One last maker's mark I'd like you to help me with is the one on this (German / Jugendstil) napkin ring. I believe it's a "S" and an "H" in a circle. Any helpful comment would be much appreciated!

[blakstone]

Not 100% certain, but I think Seybold & Hirschhauer of Schwäbisch-Gmünd.