At first glance, it may be hard to spot the error in these pieces. But it’s a big one. In each case, there is at least one 5Â¢ stamp instead of a 2Â¢ stamp.
All three were cut from larger sheets of 400 stamps. When a Bureau employee touched up the 400-stamp printing plate, he should have used a 2Â¢ transfer roll (a device used to transfer stamp images to the plate). Instead, the employee used a 5Â¢ transfer roll in three places.
One possible reason for this mistake is that a transfer roll carries a mirror image of a stamp design. A backwards 5 looks a lot like a numeral 2.