Monaco issued a set of six stamps in 1979 celebrating the 100th anniversary of their opera house, the Salle Garnier. Five of the stamps show scenes from various operas produced in the theater. The sixth (Scott 1172) shows a painting which is above the stage. The painting shows various musical instruments and players. Among them is an organ and organist. It wasn't until I was examining the image on the card that I looked more closely at the stamps and discovered the organ tie-in on this particular stamp. What a find! This is a first day of issue card. The image printed on the card replicates the painting: the organists and pipes are quite clear. With the postcard and stamp images in mind, one can just barely discern the details in the photos below. I couldn't find any images that showed the instruments, let alone the organ, any more clearly.