Luxembourg: Conservatoire

This stamp is from the first set of tourism stamps featuring pipe organs issued by Luxembourg. This is also the low value in the set. All of the sets to date have been semi-postals, meaning part of the cost was used for special projects designated by the postal administration. (In the US the one and only semi-postal stamp issued by the USPS has been the breast cancer awareness stamp of 1998, the proceeds from which went toward breast cancer research.) I have not been able to find any details on this instrument. My friends at the Luxembourg Friends of the Organ site have two studio organs available, but not this instrument which is obviously larger and situated in a concert hall of some type. Please share any information, and a Scott catalogue number if you have such information.

Mark Jameson's 2010 article provdes the stoplist and the catalogue number (Scott B 451), which I have not been able to find anywhere else:

I. Positif
Glockenspiel
Quintaton 8
Holzgedackt 8
Prinzipal 4
Rohr Flute 4
Doublette 2
Sesquialter 1
Larigot 1 1/3
Cymbal IV
Rankett 16
Comorne 8
Tremulant

II. Grand Orgue
Gemshorn 16
Prinzipal 8
Gamba 8
Rohr Flote 8
Flute Harmonique 8
Prestant 4
Tierce 3 1/5
Quinte 2 2/3
Oktav 2
Cornet III-V
Mixture V-VII
Scharff IV
Fagott 16
Trompete 8
Chamade 8
Clarion 4
Tremulant

III. Expressive
Pommer 16
Geigenprincipal 8
Vox Coelestis II 8
Viola 4
Traversflote 4
Nazard 2 2/3
Octavin 1
Tierce 1 3/5
Octave 1
Fourniture VI
Trompette Harmonique 8
Hautbois 8
Vox humana 8
Clarion Harmonique 4
Tremulant

Pedale
Untersatz 32
Prinzipal 15
Subbass 16
Oktavbass 8
Gedackt 8
Choralbass 4
Hintersatz VI
Bombarder 16
Trompete 8
Clarion 4
Cornet 2
Tremulant

I/P, II/P, III/P, III/II, III/I, I/II