Stamp Índia Travancore - Ten Cash (1921?)

The Kingdom of Travancore was a princely state of the Indian subcontinent that existed between 1729 and 1949.

Date of Issue: 1888/1921 (?)
Perforation: 12 (?)
Color: Pink
Used
Face value: 10 Indian Cash
Watermark:?

I don't know much about this postage stamp, so I can't tell if it's from 1888 (according to the "Richter Stamps") or from 1921, according to the Colnect catalog, which I guided myself.

Note: Red stain above the shell
For sale