Arne Larson estimated date of manufacture as 1923. W-shaped tuning slide. Mich. Eb tuba Date of manufacture estimated by Arne Larson at 1910. Mouthpiece is stamped York and Sons. This instrument does not have the extra doughnut of tubing for conversion.
Instrument is both high pitch and low pitch.
Bore is .465. Mich. Eb tuba Three-valve top action. Bell is 20 inches. Bore is .465. Instrument is identical to 20348.