Is the leather strap attached to the bell in any way other than via the springs? Is there a button on the top of the bell that goes into a slit in the bottom of the leather?
Sorry, I can't help you with the value of the bell. Crotal bells can go for a fairly low amount and they can go for over $100, depending on the condition, quality of casting, design, rarity, and name of maker. This one appears quite old and has detail like I have never seen. But, I don't pretend to be an expert or have great knowledge of crotal bells.
This bell is a beauty! Let's hope someone else will step forward and enhance all our educations!
Member of the American Bell Association since 1965