Shanghai, China, 1941: Selfmade mail ( brown wrapping paper) as registered letter to USA Baltimore.
Attached are 8 stamps: SYS 10 Dollar, Scott# 362 ( fault) and 9 vals from the overprinted martyr series from 1941 Scott # 477 as single and as pair, # 479 as block of 4.
Red Nov. 1941 strikes and violet Febr. 1942 Baltimore-arrival strikes.
Some creasing of cover.