Original Omega mainspring in the sealed packet part code 72203201208 for the Speedmaster Professional calibre  321 - Also suitable for calibre 320 860 861 1861 etc... and for Omega chronograph calibre 27 - 27C12 - 320 - 321 - Although the 321 & 861 mainsprings are compatible the 321 320 is stronger - Ordered more than 10 years ago as a spare for an early Speedmaster 105.003

*Please check or ask your qualified watchmaker for specifications to confirm compatibility with other Omega calibers 

*Worldwide shipping choice: $20 registered Airmail parcel or $35 worldwide ECI EXPRESS Courier International 

*Please ask any pertaining questions you may have & will endeavour to reply within 24 hours

*We can declare low $ value when requested
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