◆Bb Clarinet Adjustable Barrel (Vintage) The manufacturer is unknown, but the surface is engraved with "PAT. Feb 15-1916," indicating a patent for the design was obtained on February 15, 1916. (Based on the inscription, it appears to be from an English-speaking manufacturer.) The mouthpiece end can be rotated, allowing for a maximum extension of 15mm. Shortest length: 62mm Longest length: 77mm Standard-sized mouthpieces will fit without issue. This barrel is convenient for easily fine-tuning the pitch of the instrument. Due to the metal parts in the adjustment section, the sound has a clearer outline and is easier to focus, creating a rich and mellow tone. Although there is some aging and wear on the exterior due to its vintage nature, it has developed a nice patina. Please check the photos for the condition.