Here a famous British stamp I spied this outstanding eBay auction. Its a SG183a 1883-4 10sh pale ultramarine UM.
Item location: United Kingdom. Winner from Britain, too.

Winning bid: GBP 959.11 (approx US $1,419.15).

Item description:

GB SG183a 1883-4 10sh pale ultramarine UM
Deep rich colour.
Beautiful fresh stamp, seldom seen this nice.
Cat value £2,250 for hinged.