Ave!
Well, shoot...and here I was getting all excited.
This one is 15mm/6.0gm
They are all silver, rather small and all have the same slotted groove with remains of the original solder.
The same slotted groove with remains of the original solder is also found on these enigmatic silver ducks.
There are small silver items like this that were some form of decoration.
Certainly, but what did they decorate?