Several more Model E 1919s were created for publicity and demonstrations, and serial No. 17, sub-model E, was originally created as a full-automatic Thompson. This gun was used for various advertisement photos and articles. It was later modified for the semi-automatic mode, buttstock attachment, and front and rear sights. Following the modifications, it was later used to equip a salesman with the latest Thompson and equipment kit.
Serial No. 17 closeup.
The salesman’s kit included: the Type C and Type L prototype drums; prototype Type “XX” 20-round, box magazines; and all available canvas equipment (five-cell, single-flap pouch, Model 1919 gun case, L-drum and C-drum pouches—all made by Mills Co.). All of the magazines were produced by John’s Machine and Tool Co., Cleveland during early 1920.
In the late 1920s, this kit was sent with an Auto-Ordnance salesman to Warsaw, Poland. Poland was then in the middle of a revolution, with both the Poles and Ukrainians fighting the Bolshevik Army. The salesman hoped to sell some to both the Poles and Ukrainians. In August 1920, when Bolshevik forces threatened to overrun Warsaw, he panicked and decided to return to the United States. He gave his sales kit to Col. Elbert E. Farman, Jr., then U.S. Military Attaché to Poland. https://americansocietyofarmscollectors.org/wp-content/uploads/2019/06/2010-B102-The-Thompson-Submachine-Gun-Model-of-191.pdf 
. 1,500 rounds per minute
The Thompson Model E 1919 has a rate of fire in excess of 1,500 rounds per minute123. It is capable of firing only in the full-automatic mode123. type c
type 11