People's Republic of Congo: Bach

The People's Republic of Congo issued this stamp in 1985 as part of a set of five stamps. Each of the stamps commemorated various anniversaries or events. Included: 75th anniversary of Girl Guides; Jacob Grimm, the fabulist; the present stamp for the 300th anniversary of the birth of JS Bach; the 85th birthday of the Queen Mother in Great Britain; the centennial of the Statue of Liberty in New York. Scott 737 is denominated 350f and includes a likeness of the composer and the facade of a pipe organ. The organ is not identified; it is however, quite distinctive. The gold pipe shades and the angel atop the central portion of the facade are striking, and one would suppose not generic nor the work of an artist working without a model. One with a broader knowledge of organs might be able to identify it; I am, however, not.