Machin £1 violet printed after ruby - just found

A collector reports the £1 violet with a printing date of 15-03-07, although the £1 ruby (issued 5 June 07), was printed in January 2007. Click on image to see a larger one.

One assumption is that there was an unexpected need for the £1 stamp during the first half of 2007 before the Machin 40th anniversary (ruby) issue was to be issued, but after it was printed. Why some have appeared with this date only now is not explained but they are thought to have originated from Royal Mail Direct.