Germany issued a set of four stamps featuring musical instruments for Berlin in 1973. The high-value stamp features a positiv organ. The stamps are semi-postals with revenue for independent welfare organizations. The lower-value stamps pictured a hurdy-gurdy (.20 +. .10); a 16th century drum (.30 + .15); and an archlute (.40 + .20). Deutsche Post also issued a set of four semi-postal stamps for general usage, outside the Berlin-zone (French horn, pedal piano, violin and pedal harp). I would guess that the organ pictured in this stamp is in a museum but I don't know for sure.