The British colony of Gibraltar issued revenue stamps from 1884 to 1976.
These issues were then replaced by dual purpose postage and revenue stamps.
In fact the £5 issue of 1925 was, while also valid for postal use, mainly intended for fiscal purposes only.
This was a numeral design for social insurance and additional values continued to be issued until 1976.
At least 28 different values exist, and these were either printed by De La Rue or Bradbury Wilkinson.