Herbert Fritz Knopf of Markneukirchen single Bb/A+ horn 4+1RV

1. Front view

2. Full view

3. Back view

4. In the case

5. Body view

6. Body back view

7. Valve section

8. Valve section back view

9. Stellventil

10. Disassembled

11. Bell flare

12. Bell engraving,jpg