Great Britain 1890 10s Ultramarine (I.R. Official, white paper), SGO10var.
Superb unused example with original gum, lettered JE, overprinted "CANCELLED" type 14.
A very rare Government Official stamp used only by Government officials on government mail in this quality.
GB Specialised Catalogue No: L8(4)v.
The Stanley Gibbons GB Specialised Queen Victoria catalogue, last published in 2011, lists a value of £9,000.