This is a very well made clip which looks to be designed to hold sheet music while an instrument is being played, possibly so it could be Walked around and played? it looks like its for a Clarinet or a similar instrument and it has come from a very old estate where everything was pre 1950's, it looks very well made and circa 1900 to us. 

Does not seem to be signed and its in need of a clean up now but the springs are still very strong and it works well.

Sold as 100% period correct and not a reproduction.

Size: Approx 3.2 cm across the mount ring bottom and approx 13.2 cm long total.

Any questions please ask.