Machin Security Definitive Stamps - a new Catalogue

In 2009
Royal Mail issued 11 new Machin definitive stamps, with special security features designed to prevent re-use and deter forgery. But, because they decided to include a 'hidden' code which indicated the source of the stamps (sheets, booklets etc), there were actually 25.

In 2010 there were another 19, because the year was now coded in to the design.

Collectors were confused, dealers were confused, and catalogue editors were confused. Stanley Gibbons catalogue editors managed to assign three different numbers to the same stamp in one year (Concise, Collect British Stamps, and new Concise). And they decided to keep things simple by listing the original stamps, and those with the 2010 code separately.

But when 2011 came, 'keeping things simple' meant having one set of numbers for the stamps with no year code, and another set for those with a year code, no matter what that year was. Which is fine if you want a simple list – but serious Machin collectors wanted every variant, and dealers needed a simple way to identify separately the stamps from each year. With no central plan from SG, many dealers devised their own – different – systems.

The Norvic system is unique in that, bar the unexpected, you can work out what the Norvic numbers will be for any new stamp that is issued in 2014 and beyond at least to 2019. Our Checklist has been prepared and refined with the help of collectors and other dealers. Now that we have agreement from Stanley Gibbons to cross-reference to their numbers, we can make the Norvic Checklist available to all dealers and collectors worldwide.

In the 2018 edition of the Concise catalogue Stanley Gibbons have renumbered many of the security stamps, and left gaps for the future.  The latest edition of our Checklist incorporated both old and new numbers

The list is available to all Machin collectors free of charge - no catches.  The Norvic numbers in the checklist are the ones we use in our webshop where you can buy many of the stamps.  Note that some collectors (and dealers) record these stamps in greater detail than we do, for instance according to the size of the gap in the security slits, according to the shape of the perforation, or the direction of printing.  Ours doesn't claim to be a complete list of Security Machins according to those criteria, but it does list all the basic stamps - and a few extras.

Just put your email address in the box - please check that you have entered it correctly - and check the 'Yes' button - then click the 'Email me the checklist' button.  But, if you aren't sure there are samples from some of the pages below. 

Minor updates will be mentioned on our blog. Unless you are a customer you won't receive any other emails.

15 September 2018 - version 2.0.8 added – includes 2018 Walsall printings including both phosphor types, and the revised numbers in the SG GB Concise Catalogue

IMPORTANT: you should only need to download our file once for each device.  It will be attached to the email and can then be saved on your computer, tablet, smartphone, e-reader etc.   The pdf file does not change daily, and new editions will be announced on the blog and website home page.

Please enter your email address:

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Thank you - your checklist will be sent by email as a pdf attachment. 
You may need to download Adobe Reader from the Adobe Site.

If it doesn't appear in your inbox within a few minutes, check your spam or junk folder.  If it's not there, please try again, checking your email address carefully.  If you still don't receive it, send an email to and we will send it to you by email.  (Include a name and phone number if you are in the UK - we'll only call you if we need to check the address.)  

If you find any errors, or have any comments or suggestions, please do contact us at the email address above.

News about other stamps issued, or found, will be mentioned on our blog.

Privacy UPDATE
When the Checklist is sent to you, an email is sent to us to show that you have downloaded it.  That email is stored on Google's servers, and the email address may be automatically added to our address book/contacts list.  We will not use this information to contact you, and unless you have bought from us and provided us with your name and address, no other details will be held in connection with this Checklist.  This complies with European GDPR.

Sample pages

2nd class

2nd class table.

Gummed stamps

Gummed stamps table.


booklets table.

First Day Covers

FDC table.

Year by Year Summary

Year by year summary page.

Produced by Norvic Philatelics 2018
Stanley Gibbons numbers used by kind permission of Stanley Gibbons PLC