Perf 11.....
look at the bottom of the two stamps, and you should see just how different these two stamps are. They are from two different series, with two different design numbers.
Aside from the fact that these stamps are from different sets, there are many factors affecting stamp size. One is paper shrinkage after printing, in particular for recess printed stamps which are often printed on damp paper. Orientation also plays a role - due to the way paper is made industrially, there is a preferred orientation of the fibres, and damp paper shrinks differently parallel or perpendicular to it. Different plates may have been used when a stamp is printed in large numbers. Printings from cylinders may have a slightly different size from plate printings, and may be slightly elongated or compressed in the direction of the cylinder rotation. Then, many US stamps are line perforated, and the distances between the perforator strikes may vary not affecting the size of the picture, but of the stamp overall. I'm sure I've forgotten something ...
-jmh
You're trying to compare apples to oranges. They are two different stamps from two different printings and time periods. You have to compare the same stamps to each other, not different ones.
re: Still struggling with these Washingtons.
Perf 11.....
look at the bottom of the two stamps, and you should see just how different these two stamps are. They are from two different series, with two different design numbers.
re: Still struggling with these Washingtons.
Aside from the fact that these stamps are from different sets, there are many factors affecting stamp size. One is paper shrinkage after printing, in particular for recess printed stamps which are often printed on damp paper. Orientation also plays a role - due to the way paper is made industrially, there is a preferred orientation of the fibres, and damp paper shrinks differently parallel or perpendicular to it. Different plates may have been used when a stamp is printed in large numbers. Printings from cylinders may have a slightly different size from plate printings, and may be slightly elongated or compressed in the direction of the cylinder rotation. Then, many US stamps are line perforated, and the distances between the perforator strikes may vary not affecting the size of the picture, but of the stamp overall. I'm sure I've forgotten something ...
-jmh