First U.S. Rotary Stamp
On June 30, 1914, the US issued its very first stamp printed on the rotary press. It’s also the only imperforate US rotary press coil.
Prior to 1914, postage stamps were printed using the flat plate method. Sheets printed by this process contained 20 rows of stamps with 20 stamps in each row. The introduction of private perforating machines presented a problem. Workers had to paste strips of 20 stamps together, end to end, to form long coils before they could be fed through the machines. This was inefficient and costly.