30¢ Bison
(read how to identify your stamp below)

This is the 30¢ American Bison from the years 1923-31.

The first variety (#569) was issued in 1923 and has a perforation guage of 11 all the way around. This stamp can be found by clicking here. The second variety (#700) was issued in 1931 and has a perforation guage 11 at the sides and perf guage 10½ on the top and bottom. This stamp can be found by clicking here.

If you do not possess a stamp guage and are lucky to have another stamp from this same series there is another method of indentifing the number of perforations on each side. If you lay one stamp face up in front of you, on a flat surface, place the other stamp's left side next to your stamps bottom side to see if it has an exact match up of the perforations all the way down the side of that stamp. If by pointing the tips of the perforations, of each stamp, together they will touch all the way down, the perforations on that side of the stamp are perforation guage 11. If, however, the perforations do not match identically and there is a slight mismatch, then that side is a perforation 10 1/2.

To determine the difference the two varieties of the 30¢ Buffalo one needs to look at the perforations. You will need a copy of the very common 1932 3¢ Washington (#720). A picture of which is shown below. Follow the instructions below

There is another way of determining the difference between #569 and #700, that is to look at the type of printing. #700 was printed using the Rotary Press Printing which makes the stamp wider and longer than #569 which was printed using the Flat Plate Printing method. An illustration of the degree of difference between the two printings is shown below;

Lastly #569 tends towards olive brown whilst #700 tends towards brown.