I have had a couple of these before, and I really rate them. 
The design is so clever, a secure pin with no moving parts or fiddly catches, and there is zero compromise on the elegant Art Nouveau form. 
This cab be worn alone as a pin, which is just perfect, but will also work if you add charms, and/or clip it into a chain. 
The turquoise set into the end just finishes it perfectly
 
Stamped and tested as 9ct gold. 
Also stamped with maker's mark, MB&Co and the patent no for the design. 
Weight approx 2.31g 
Length approx 45mm
Excellent antique condition