Pre-WWII Cerveny BBb sousaphone 4RV

pre-WWII Cerveny rotary BBb sousaphone 4RV serial # 37521

1. Full view

2. Valve section

3. Valve section back view

4. Valve section back view #2

5. Body

6. Maker';s shield

7. Disassembled

8. Clocksprings

9. Czar Sasha - so named by a later owner

10. With former owner Mark Rubin