This is a vintage Chinese export sterling silver blue enameled articulated fish charm or pendant. It is marked Silver on the bail.
This fish measures .75" long excluding the bail, and 1" long including the bail. It is almost 1" across at the widest point.
Condition is good.I see no enamel loss.
This small fish is composed of 7 articulated layers, including the head and tail. It is quite a complex piece for something of such small size.