The
B, C, G, J & K prefixes with the 5-digit numbers may be the most difficult to pin down moving forward in terms of when/why and for who. From 41/42 on (
it appears), AFTER the V (760,000-1,000,000) and then the below W showing 1,000,000+ numbers seem to have been followed by the "B" + 5-digit serials during or through 41-45 along with C,G,J & K. The "P" prefix used during 1936 was then resurrected and used once more. (see below) These B-5 digit and P-7 digit serial numbers are possibly during & post war, They are certainly confusing to me as well as others... The P1215104 is the highest clear stamp over 1,000,000 yet...any thoughts or insights on these two examples below ?