What happens when stamps are no longer valid for use

Postcards & Mail Mail, stamps & postal info
21

I’m curious - what’s a Machin stamp & how is it different from a commemorative stamp?

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It is (was) the main definitive stamp series in the UK.

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23

In Spain, from October 2000 to January 2002, stamps were issued with their equivalence in euros = pesetas.
Since 2002, stamps with values only in pesetas ceased to have postal value for mailing.

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24

Per Royal Mail, the deadline to use non-barcoded Machin stamps has been extended until July 31, 2023. An official statement is expected today.

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25

In P.R.China, all the stamps from R.O.C is illegal to use

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In Russia, postage stamps issued since 2000 can be used for postage. But due to the small denominations of postage stamps from the early 2000s, it is rarely used today.

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