China. (French Indo China). 1900. Charged Official Mail stamp-less envelope addressed to Hanoi headed 'Postes & Telegraphes' cancelled by Thai-Binh/Tonkin double ring '7th Mars 1900' with hand struck 'Charge' and circular 'Postes et Telegraph/ Annam/ Tonkin' routed via Nam-Dinh with double ring arrival in Hanoi on reverse. Rare, not listed in Desrousseaux.