The remaining numbers indicated the production number within the month.įrom 1987 on, the two-digit prefix number plus 50 will give you the year of manufacture. The fourth character indicated the instrument: They were made only a couple years, so they are pretty rare, especially in this condition. The third character indicated the year within the decade (defined by the first letter). Note: From 1987 to present, add 50 to the serial number prefix to calculate the year of manufacture. The second character indicated the month of the year

The first character of the serial number indicated the decade Conn started using letter prefixes on serial numbers in 1963. In March of 1974 an alpha-numeric system was established: The years 1967 to March 1974 (when Conn moved their brass manufacturing to Abilene, Texas), is a period where at least some of the instruments were inferior in quality Search for the serial number of the brand United Musical Instruments USA - Conn to determine the age of your instrument. 1980-1986 numbers are inexact, and may relate only to student level trumpets/cornets

Conn trumpet serial number 250423