This whip has a staghorn handle.
There is a silver button on the heel of the staghorn which is stamped "Swaine & Adeney Ltd. London".

It has a silver collar with ribbed edges, this is stamped "Swaine" and hallmarked although the hallmark is too rubbed to read.
The collar is engraved "JOAN from Jimmy 6-11-35" . 

The slim stock or shaft is covered in brown braided leather.

It has its original stitched leather keeper and a braided leather thong with a loop at its end and a red cord lash

Dimensions : Staghorn : 5" (12.8cm) Length (not including keeper) 19" (48.2cm), keeper 6¼" (16cm), Thong (not including lash) 51" (130cm)
Weight 278g (9¾ oz)

Ref : whip1818