The Thunderbirds mixed booklet has M11L at top left, and MCIL at top right. Like all booklets of 6 these should see early and widespread use and should be found on mail and in kiloware by the end of January.
ATM NEWS ~ Spain - Boston 2026 World Expo
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Boston 2026 World Expo
Issue Date: May 23, 2026
Label Size: 55 x 25 mm
Printer:

I received a MNH single through the post on 5/1/11(not due until 11/1/11)so look for early used.
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