I've discovered this stamp in amongst a load I bought several years ago. I generally use Deegam to catalogue my stamps, but I cannot find this listed anywhere. Is this new, or just yet another variety of an existing known stamp? Any thoughts or comments would be very welcome. Apologies for the poor ...

Many thanks for that!

Firstly, let me apologise for asking what to many of you will be a very dumb question. I mainly collect modern GB definitives, but also have a large collection of George V and IV stamps that need cataloguing and sorting. For the life of me I cannot find any information on what type of gum was used. ...