Got this cover recently from a fellow member of the Sarawak Specialist Society. This is a commercially used item bearing the correct rate of 20c for a airmail letter to Malaya plus 25c for registration. The stamps are well franked with a fairly clear Papar D4 bintang postmark.
The cover is a bit water stained and weathered which gives it an air of authenticity. It is probably a "flood" cover!
Definitely, it was worth paying the extra 25c for the reg label and all those postmarks!
Thank you Stuart.
Happy New Year!