From Alderney (Bailiwick of Guernsey), marking the next Solar Eclipse to take place on 21 August 2017:
The full disc of the Sun is shown when the stamps/MS are exposed to heat (warm hands should suffice).
Issue date - 19 July 2017
designed - The Potting Shed
Printed - Joh Enschede
Method - offset litho
Six stamps (of the values shown in the MS) were also issued.