Following our report of the 1st class Machin stamp appearing in kiloware with four security slits we have now been sent an image of the 2nd and 1st with four slits.
These are soaked off and have machine wavy-line postmarks so
(a) we don't know where they were posted, and
(b) they have been through mechanised sorting unlike most of the other odd-ball security Machins which have packet handstamps.
Both these and the previous 1st class (shown again below) have very flat 'tops' to the perforations, similar to, but possibly flatter than, the Walsall stamps in mixed booklets, and are probably from business sheets. But their real origin remains a matter of speculation.
We still await any reports of these found unused.
My 50th Anniversary columns for Linn's Stamp News - For my last Great Britain columns for *Linn's Stamp News*, I decided to go out with a bang and summarize the history of the Machins in a format that would...