Helicon.

Description

Technical description: Brass; french bell rim. The main tubing has 1½ coils after the valves; there is a tubular cross-piece in the main coils to support the valves and one of the mouthpipe stays.Adjustable curved mouthpipe with two adjustable stays. With fitting for music-card holder on receiver for adjustable mouthpipe.; Nominal pitch: 13-ft E?.; Type or system: 3 valves.; ; ; ; Usable pitch: Probably built for use at circa A?=|460|Hz.;