This lovely example of a reproduction natural horn was created by noted hornist and horn builder, Lowell Greer. The design is based on a horn by Franz Stohr of Prague, whose instruments are regarded as some of the finest 19th century horns in existance.
These horns were popular at the onset of the 19th century and used for performances of Mozart, Haydn, and Beethoven in the city which was very significant for all three composers. It comes equipped with C alto and G crooks along with 5 couplers that together comprise every key, chromatically, from C alto to Ab basso. The bell profile is ample, with a small bore (.439"), and long slow tapers in the master crooks, all of which make this model one of the most "user friendly" replica horns available. Hand stopping is easily accomplished, with good blendability of tone, accurate pitch, robust tone, quick response, and an exciting character of sound. Even though the voicing is quieter than modern horns, our modern "hollywood ears" will enjoy the broad tonal colors of this engaging natural horn. The crook inlet best receives a reduced shank mouthpiece. Bell diameter is 11 7/8 inches and bore through the slide is .439 inches.
GREER HORNS This horn is designed to exemplify the finest in historic replica and restored natural horns, both in terms of budget, and from the perspective of authenticity. Greer horns are models which were developed from archtypical original instruments which were the "player's choice" during their periods of original use, and have been thoroughly tested during use in some of the world's finest early music ensembles.

information taken from:
http://greerhorns.webs.com