Dug this out of a club dollar box, mostly because of the parcel post cancel on the front. I know relatively little about parcel post, neither uses nor rates, so you can imagine the incredible growth possible.

At first blush, without the PP CXL, it looks like an ordinary WWII APO air mail. The APO is in England (although he wrote 636 in his return address, which is the Indian theatre).

But the PP CXL is possible, according to Tony's book. It features a cover from the same period (although not military) in which the rate for under 4 pounds is 1.5c per ounce. Exploring backwards, then, this could be 1.5c x 2 = 3c, plus 3c for first class mail. Military mail is allowed free franking for all first class mail, but loses that concession rate IF any other rate category (air mail, registry, PP, etc.) is employed. But there's nothing on the cover that indicates the corporal intended to send something parcel post; only the cancel at the receiving end. But (yes another but) there's also the delay between sending and receipt (November 19 - December 4, a full two weeks). Yes, planes were pretty full, but still, it looks as if it was sent first class, not air mail.

So, I'm looking for your help. Am I on the right track thinking it might be Parcel Post? Why or why not?