The above cover from St Kitts to New York, USA bears a 5/- value (the perforation holes around the marginal markings identify this as being from the scare 1941 printing, as per P.L. Baldwin's book) sent 20th July 1944 via registered post. Censored with clear tape 'Examined by 20020' and forwarded by air mail via Antigua and Miami, attracting a variety of handstamps:
22 July 1944 Antigua, St Johns
28 July 1944 Miami, Florida - Registry Division + 729c
28 July 1944 New York - Registry Division
4 Aug 1944 New York - Registered (STA.P.)
8 Aug 1944 New York - Registry Division
I have the following queries:
1) What is the backstamp 'yX' on reverse?
2) What is the significance of 729c?
3) The 5/- value is much higher than registered mail as this time. Can anyone explain reason for overpayment, as it doesn't look like a philatelic cover to me?