Mail disinfected in Gibraltar it is quite an interesting topic. Denis and Garcia in the monograph printed in 1994 for Disinfected Mail Study Circle presented a lot of material some disinfected for sure in Gibraltar, other perhaps. The material it is not abundant. Here I show a letter written on October 9, 1850 aboard HMS Bellerophon and records eight death from Cholera after leaving Malta, one every day and no more cases after eight days. Pair of 26 mm chisel cuts and heat discoloration of the letter is similar treatment to two letters described by Denis and Garcia dated 1849. The addressee was in Nottingham.
Postal marks: Gibraltar SHIP LETTER mark recorded use November 22, 1843 to April 12, 1851, in blue ink from November 29, 1849.
Datestamp recorded used November 6, 1849 to April 12, 1858, only known in blue.
Liverpool SHIP LETTER mark used in black 1841-55.
On front marked "8" pence, the rate for incoming letter to UK for up to half an ounce, implemented in 1840.
The two letters Denis and Garcia showed are from different origins with same chisels pattern and dimension as mine and were done in Gibraltar.