When directed by Royal Mail to change the printing process and the subsequent change over to the ATN press (computerised Gravure) we all thought that modern Machin printing errors would dry up in the philatelic market place. Well this has proved to be very true to an extent, not a lot seems escape these days. But can they say "job done", not quite!!
The missing £ sign on the £2.00 Machin value caused a stir and the story is well documented, but have you heard or seen reports of the £5 Ochre-Brown printing in the unissued iriodin ink colour?
This block of 6 was put up for sale at David Feldman (Philatelist auctioneers) in a All World Auction during 2008. I do not know if the block sold.
Imperforate Machins still seem to appear on a regular basis. Several Machin values have been found impeforate over the last few years, these consisted of multiples in blocks (now split into smaller blocks and pairs). The 20p Bright Green Machin was one value of which is still readily available from dealers at a modest price.
Other De La Rue imperforate Machin values of 35p Sepia, 39p Grey, 40p Turquoise-Blue, and 43p Emerald have been offered for sale by specialist dealers.