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 London 1921.
The collar is engraved "C.C. from J.C. 8-6-21" . 

The stock or shaft is covered in brown braided linen or hemp thread.

It has a stitched leather keeper and a pale braided leather thong with a bound end and a cord lash

Dimensions : Staghorn : 6¼" (16cm) Length (not including keeper) 19¼" (49cm), keeper 5" (12.5cm), Thong (not including lash) 32" (81cm)
Weight 261g (9¼ oz)

Ref : whip1788