Undated lettersheet from Ambon Missionary Society sent as maritime mail (Zee Brief) to Zierikzee and thence to the missionary society in Rotterdam. Amboina began using the zeebrief postmark from 1843, so this letter must predate this and was marked by the negative-impression Amboina Ongefrankeerd postmark which is recorded on four letters only, 1841-1842. The letter went from Amboina via Batavia and was charged 180 cent on arrival.