Ball Bearing Rotor

Oldest

Invention of the Ball Bearing Rotor In 1948, Eterna announced a friction-reducing ball-bearing mounted rotor system as part of the...

Manufacturer ETA / Valjoux Caliber Number 7753 Movement Type Automatic Jewels 27 Power Reserve 48 hours Diameter 13 1/4”’ (30.00mm)...

Manufacturer Montblanc Caliber Number 4810 502 Base Caliber ETA / Valjoux 7753 Movement Type Automatic Lignes 13 1/4”’ Diameter 30mm...

Brand Mido Caliber Number 60 Base Caliber ETA A05.H31 Movement Type Automatic Jewels 27 Power Reserve 60 hours Lignes 13.25”’...

Manufacturer Montblanc Caliber Number 4810 503 Base Caliber ETA / Valjoux 7754 Movement Type Automatic, chronograph Lignes 13.25” Diameter 30mm...