I have discovered a new test stamp.
It is red in color and is rouletted 11. The design size is 18.5 X 22.5 mm.
There are currently two known copies of this stamp. Both are without gum.
Hopefully the stamp will get listed in Scott one day.
p.s. I forgot to mention that this very early stamp precedes most of the other Scott-listed test stamps. It should be inserted into the listings before TD10.
Henry Sandor Klein and Benjamin Franklin Klein of Milwaukee, Wisconsin patented their stamp sticker device on November 21, 1899. They received patent number 637,393.
They also received a patent in Great Britain on October 31, 1899. That patent number is 189921790A.
They formed the Klein Manufacturing Company to make and market their new device.
A portion of the Klein patent:
This appeared in The American Stationer
, Volume 47, Number 8, February 24, 1900, page 22.