Latvia issued this stamp in 2000 as part of a set of four celebrating the 800th anniversary of the founding of the city of Riga. The organ was built in 1883-1884 by the Walcker firm of Germany. It was rebuilt in 1981-1984 by the Flentrop firm of the Netherlands. (Interesting note: I was on a semester abroad experience in Munich in 1981 and travelled to the Flentrop shops with the father of a friend, as he delivered final payment on their church's new Flentrop organ. Of course, while at the shops, I saw work being done on the Riga Dom organ. "Incredible" barely begins to describe the sensation!) My able to read Latvian is limited in the extreme but it would seem there are 124 ranks over four manuals and pedal, and over 6700 pipes in the instrument.