Afternoon Team
Scan shows a cover with Advice of Receipt Form cancelled TRESOR ET POSTES 515 2 February 1918. Located somewhere in the Salonika area.
First I've ever seen, If I work it out correctly this entire was sent out from SP 515 in connection with a Registered incoming letter endorsed A.R. for 'Advice of Receipt'
If correct shows the the French Military Postal System operated a A.R. system which the British Military Postal System didn't.
Comments welcomed.
Chris