Ball Bearing Rotor VS Bushing RotorsInvention of the Ball Bearing Rotor In 1948, Eterna announced a friction-reducing ball-bearing mounted rotor system as part of the...Guides·0
ETA/Valjoux Caliber 7753Manufacturer ETA / Valjoux Caliber Number 7753 Movement Type Automatic Jewels 27 Power Reserve 48 hours Diameter 13 1/4”’ (30.00mm)...Automatic·3
Montblanc Caliber 4810-502Manufacturer Montblanc Caliber Number 4810 503 Base Caliber ETA / Valjoux 7753 Movement Type Automatic Jewels 27 Power Reserve 48...Automatic·3
