1907 Ahlberg & Ohlsson F-helicon 3+2BP

Jun 22, 2009
1. Valve section view #1
2. Piston Berlin style
3. Back view
4. Piston’s top vents
5. Valve guide screw
6. Piston’s bottom vents
7. Valve guide screw in casing
8. Slit for valve guide
9. Piston Berlin style view #2
10. Bell engraving
11. Valve section view #2
12. Valve section back view
13. Full view
14. Valve section back view
15. Body view
16. Full view
17. Valve section view
18. Original valve spring
19. Bell engraving
20. Body back view