Vlad. Kupka of Mar. Hory in Moravia F helicon 4RV

1. Bell view

2. Front view

3. Valve section view

4. Backside view

5. Full view

6. Bottom bow view

7. Large bow view

8. Stay view

9. Details

10. Bell engraving

11. Leadpipe view

12. Kranz

13. Disassembled

14. Kranz