Arts and Crafts "Cymric" silver inkwell by Archibald Knox for Liberty & Co.
Photograph and description courtesy of Morgan Strickland Decorative Arts.
This is model 500/75. A silver and enamel version can be seen in Dr Stephen A Martin's book "Archibald Knox" 2001 page 223. The one illustrated in the book is hallmarked 1900 and is 9.9cm high.