1. WatchBase
2. Omega
3. Calibers
4. 321 B

Omega caliber 321 B

Brand:	Omega
Reference:	321 B
Base:	Lemania 2310
Movement:	Handwound
Display:	Analog
Diameter:	27.00
Reserve:	55
Frequency:	18000
Chronograph:	Chronograph, Column wheel
Hands:	Small Seconds, Hours, Minutes

All watches using the Omega 321 B movement:

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311.93.42.30.99.001 Omega Speedmaster Professional Moonwatch 321 Platinum / Black / Alligator

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311.30.40.30.01.001 Omega Speedmaster Moonwatch 39.7 321

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311.50.39.30.01.001 Omega Speedmaster 321 38.6