Luxembourg issued this stamp (Scott #772) in 1987 to celebrate the millennium of the Church of St. Michael. It is part of a set of 2 stamps issued for that event. The other stamp features stained glass from the church. The organ was built in the French classical style by G. Westenfelder in 1971. Details in the Scott catalogue call this a "Baroque organ chest, 17th century." There are no details on the Luxenbourg Friends of the Organ site to help us know if the organ is contained in a very old case containing new works by Westenfelder, or if the whole instrument is new, built built in a 17th century style. If the latter then Scott errs slightly.