A cover sent in September 1904 from the Hotel de l’Europe to France using the movable box service appeared on day one of Auktionshaus Christoph Gärtner’s 50th Jubilee auction – which closed on 21st June 2021 – as lot #08979 offered at €250. This attractive cover finally sold for €260.00
Bearing a strip of three KE VII ½d stamps and one KE VII 1d stamp cancelled at Carteret on 23rd September 1904, the cover also shows a superb PAQUEBOT marking. Initially addressed to Blois, where it arrived the following day, the cover was re-directed to Mesland.
Gibbons[1] records this type of Carteret three concentric circle cancellation as used between 1898 and 1908 on Boîte Mobile mail.
Reference
1. Stanley Gibbons Channel Islands Postal History Catalogue Ringwood & London: Stanley Gibbons Publications Ltd, December 1991.