This was originally made by Ingersoll as a ladies Pocket watch, however as it was easier for a serviceman to use a watch on his wrist, as opposed to fumbling in his pockets for a pocket watch in the trenches, the Waterbury Clock Co was commissioned by Ingersoll to add D lugs on the 6 and 12 on to the watch to make the 'first true' wrist watch, these were sold to servicemen going to the front, both .
Jul 22, 2010 · The Ingersoll Midget was a smaller, thinner style, introduced in 1912. This watch was small enough to have lugs soldered onto the case at the top and bottom (with the winding stem at the 3 o'clock position) so that a strap could be added and the watch sold as a wristwatch.
The Ingersoll clock-watch was also offered at the 1892 Columbian Exposition for $1.50, where it is estimated they sold 85,000 watches! The positive response prompted Ingersoll to return to Chicago for the World's Fair in 1893, where a new clock-watch with the World's Fair emblem stamped into the case was a huge success.