Date: 1920's, Owned by Ormand Jones
The 2L is the Low Pitch version, the 3L is the High Pitch version. Both are in the key of G with an F slide. Both the 2L and 3L were made between at least 1919 and 1927, and probably were discontinued in 1929.
What Conn said in 1924:
The Wonder Bugle in G with F slide is also known as the Military Trumpet, and is built with the same care and exactness as every Conn instrument. This model is used by all the most discriminating buglers of the United States Army and Navy.