This Conn 12H trombone is a classic example of the Elkhart-era Coprion models, dating from the late 1940s. It features a 7" seamless copper Coprion bell that has been de-lacquered and polished, enhancing its warm, rich tonal character. The handslide retains its original lacquer and is in very straight condition, providing smooth action and excellent playability.
The Conn Coprion bell is a standout feature — made from a seamless spun copper sheet rather than traditional brass. Introduced by Conn in the 1930s and 1940s, Coprion bells were designed to produce a more focused and projecting sound with a slightly darker, warmer timbre. These bells are known for giving players extra clarity in loud ensemble settings while still maintaining a sweet, colorful tone at softer dynamics. The seamless construction also helps reduce stress points that might otherwise affect resonance and longevity.
With an approximate .484 bore (similar to the Conn 4H), this small-bore model excels in lead playing, Dixieland, traditional jazz, and New Orleans-style music. Many jazz and commercial players appreciate the ease of articulation and crisp response of these instruments, making them an ideal choice for front-of-section or solo work in vintage jazz bands.
This particular instrument was offered with its original case, highlighting its classic vintage appeal and making it a collector’s piece as well as a practical player’s horn. Vintage Conn instruments from the Elkhart era are highly sought after today for their craftsmanship, distinctive sound, and historical significance in American brass manufacturing.
This listing is part of our Archive of Sold Instruments and serves as a reference for musicians and collectors interested in vintage Conn trombones.
