GB KGVI Training Stamps

Hi,

I've picked up a set (not sure if complete or not) of what are described as GB KGVI training stamps. These look like a mixture of the wartime light colors and the late color changes with two parallel vertical bars running through the front of the stamps.

I've looked in both my SG Concise and 4 Kings Specialised and do not see a reference. Have I missed a listing in there and if not, is there some place with more information about these?

Thanks

-Larry

More than you'd ever want to know (but no pictures):

http://www.philatelics.org/reference/oldbook.pdf

Queen Elizabeth behind bars :

At the "Marker Monkey" Training School:

22crows,

thanks very much for the link. You're right, it might be too much but at least it is something.

-Larry