This five-stop continuo instrument, built by Georg Westenfelder of Luxembourg, was used for many years while the gallery organ was unplayable. The nameplate inside the case does not indicate a date, but it is believed the organ may have been built in the 1960s. There are five unlabled stops, each having two slides to activate the treble and bass ranges of the 53-note manual keyboard that divides at tenor B (B24) and middle C (C25). The manual can be transposed one-half step by sliding the keyboard. The blower is contained in the base of the case.