RE Series No 11
Date: 17 March 1973.
Title: The Tower of London Built by the First King's Engineer.
Type: Commemorative Cover.
Stamps: 3ᵖ "Silver Wedding" commemorative, issued 20 November 1972.
Special Handstamp: Corps of R.E. Commemorating Bishop Gundulf, the King's First Engineer and Builder of the Tower of London, BFPS 1381.
See: Wiki - Gundulf of Rochester - http://en.wikipedia.org/wiki/Gundulf_of_Rochester
bfpsgundolfresnseries notower of london