Royal Mail Post and Go Stamps

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Trace Royal Mail Post & Go Stamps

Look at the image of the Post and Go faststamp below and you see we have highlighted the first six numbers of the stamp overprint code. These six numbers identify the location where a Post & Go stamp was issued. As Post & Go machines were developed some locations were allocated alphanumeric codes beginning with an A or B rather than completely numeric identifiers.

To check where a Post and Go stamp was issued enter the six numbers (or characters) on your stamp in the search box at the top of the right hand column on this page.

Post and Go stamp location code

What do the other Post & Go numbers or alphanumeric codes mean?

The number following the location identifier (1 in the above example) is the machine number (sometimes referred to as Kiosk). Early Post & Go stamps only used 1 digit for the machine number but 2 digit machine numbers were soon introduced. Some Post & Go locations have multiple machines and this part of the code enables collectors to identify the specific machine that issued a stamp.

The next number between the hyphens (12405 in the above example) is called the session number. This number increases over time and represents the machine usage sessions by customers (regardless of the number of items they purchase within a specific session). Early Post & Go stamps used 5 digit session numbers but this was then increased to 6 digits 9except for stamps using the alphanumeric locations starting with a b which used only 4 digit session numbers). The latest NCR Post & Go machines are again using 6 digit sessions.

The last number can reach a maximum of 99 and represents the item number vended during a specific user session. In the above example the number is 14 meaning it was the 14th stamp issued in the user session.


  • Post & Go machines issue a new generation of self-adhesive British postage stamps that are rapidly capturing the interest of stamp collectors. Post & Go stamps are now available from machines at numerous fixed locations in the UK plus some museums and a few additional mobile and philatelic identification numbers used at exhibitions etc.

    While we wont be providing the basic information about Post & Go stamp issues - as that is available from existing philatelic blogs and websites - we do plan to develop useful tools and other resources to help collectors identify, catalogue and write up their Post & Go stamp collection.