What is this tag/stamp on a card from Hong Kong

I got this card from Hong Kong which had this tag attached at the side.

It has some numbers on the address side.

Does anyone know what this is?

I feel like I saw something about this on the forum before, but I can’t find it.

This is a Postage Due stamp also called ‘T’ stamp. There is a post about it here:


Thank you!

I found more information about this from the UPU manual, I took a screenshot of the relevant portion:

Interesting! I definitely did not have to pay anything, and it’s hard to believe the cost of recovering one or two HK dollar is worth it. Make sense for a package, maybe.

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Surface mail costs $4.60, while air mail costs $4.90.
Perhaps the sender didn’t use sufficient postage. :slightly_smiling_face:

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