This old driving bit is made of steel.
It has a half twisted mouth with a medium port.
The straight cheeks have two rein slots for the attachment of the curb rein. One cheek is stamped "E. Watts", the maker or retailer, and the other "London". Unfortunately I cannot find any records of E.Watts as a saddler or loriner.
The cheeks are joined by a shackle or bottom bar.
Mouthpiece 14cm (5½")
Cheeks 22.8cm (9")
Weight 640g (1lb 6½oz)
Ref : bit481