Pre-WWI Cerveny Db helicon 4RV - the old style Cyrillic letters of the shield indicate, that this instrument was intended for the Russian market

May 11, 2010
1. Maker's shield in old Cyrillic letters
2. Bad bow guard repair
3. Broken elongation of tuning slide receiver
4. Kranz close-up
5. Kranz
6. Back bows
7. Disassembled also in a wrong place
8. Bow guard
9. Valve section back view
10. Full view
11. Bell flare repair
12. Valve section view