10¢ blue Altered Plate bottom sheet margin block of 4, Unofficial Printing. Although this printing plate for these stamps was ordered by the Confederate government, it was never put to use. It is so called because the 5¢ rate was altered to 10¢. Cut up for souvenirs, the plate sections are now in different private hands and have been used over the years to print souvenirs in many different shades. $10.