The first step is make you sure that you have a rotary press printing and not the common flat press printing and that the perfs are 11 and not 10. The next step is to get it expertized which means you pay an authority to certify that it is genuine.
I am assuming that it is in good condition. If it is a wreck it may not be worth the cost of expertization.
After you get it expertized you are ready to look for a buyer. Be prepared for a lot of questions about where you found the stamp. This stamp is very rare and a copy from a previously unknown source will attract some attention in the philatelic world especially if one has been reported stolen.
As for selling it, you have some options and I can not tell you which would be best. You could sell it directly to a dealer. There are not very many dealers who deal in stamps this rare but there are more than one and I would get more than one offer. You can put it up for consignment- there are dealers that will try to sell it for you at a commision, of course, if they find a buyer , or
you can put it up for auction with an auction house that sels rate stamps or rare collectibles.
HARDING MEMORIAL ISSUE 1923 Denomination: 2c Color: Black Print Method: Rotary Perforation: 11 (horizontal) VALUE: Used $25,000.00
The market for antique telephones is rocketing. There are keen buyers of Bakelite and old school rotary phones, and some older examples of pulse dialing phones too.
Tropicalized Rotary means
function of rotary camera
did the rotary engine (Hargrave lawrence) help
Rotary International was created in 1905.
Rotary Watches was created in 1895.
rotary motion is movement that goes in a circle
Rotary Broaching is a method of producing both internal and external forms fast and accurately on the end of a workpiece. Rotary broaching makes it possible to very accurate forms within 0.0005 inches within seconds. With rotary broaching not only can you produce standard shapes such as hexagons and squares but also shapes such as Double Hex Rotary Broaches, 6-Lobe Rotary Broaches, Serration Rotary Broaches, J500 Rotary Broaches, Spline Rotary Broaches, Involute Rotary Broaches, Torx Rotary Broaches, Double D Rotary Broaches and any other Special Design Required. Rotary broaches can be made to just about any size, English or Metric. Some of the material that can be rotary broached is brass, aluminum and steel and can go as much as 2 inches deep.
A rotary system can be used to calibrate flowmeters. Unless you are refering to a rotary telephone system, in which that works differently.
epitrochoid
Rotary is used to describe something that has the capability of rotation.