According to an article on ChannelOnline, on 4 July 2013 the States of Guernsey began selling 300,000 1-pound notes to commemorate the 200th anniversary of Thomas de la Rue’s first commercial venture. This commemorative note is like the preceding normal issue for this denomination, but enhanced by a design featuring Thomas de la Rue on the back and a TD/LR prefix. It is also the first series of 1-pound notes to feature the signature of States Treasurer Bethan Haines. The notes are sold at double face value, plus £8 S&H.
Courtesy of Pam West (http://britishnotes.co.uk), Philip Martin, and Jan Stuller.