Karl Dressel of Markneukirchen compensating double horn 4RV

1. Body

2. Change valve - reversable

3. Engraving b

4. Engraving d

5. Valves rear

6. Paddles b

7. Paddles

8. Valves rear b

9. Full b

10. Full

11. Body rear

12. Engraving c

13. Stopping valve lever b

14. Engraving a

15. Stopping valve lever