This is a Post & Go Machin R20YAL Collectors strip of 6 with 'Last Overprint at: HMS Trincomalee' overprint without the logo in error, from the Union Flag slot in machine A006 at HMS Trincomalee, Royal Navy Museum in December 2023.
Only a few Machin R20YAL Collectors strips with this overprint were picked up without the Logo, so this strip is very scarce.
The stamps are on their original backing paper and the strip is supplied with a matching receipt.
(Please note that the date and transaction number on the stamps may vary, but the stamps and receipt will match.)