Επειδή λες αυτό: "να ειναι open back ωστε
να χαζευω τον υπεροχο μηχανισμο του!"
Η απάντηση -πιστεύω- ότι είναι αυτό:

Archimede Pilot XL Hand Wound with Eta 6498 TOP
ollectors will be familiar with this superb, high quality movement. It is not only the magnificent decorated back, with Geneva stripes and blued screws, that makes this version so remarkable; the internal features are equally striking. Here are a few:
· 21,600 beats per hour (BPH)
· Incabloc shock protection
· Glucydur balance wheel
· Nivaflex NO barrel spring
· Nivarox Anachron hair-spring
· > 50 hours power reserve
The TOP version with the higher BPH allows higher levels of accuracy compared with the standard 6498 movement.