17+ Omega Calibre 1861 Accuracy US. Submitted 5 years ago by apprehensive_andy. Every watch is different, so you i have 2 1861s and an 863.
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321, 861, 863, 864, 866, 867, 1040, 1861, 1863. The speedmaster professional houses caliber 1861. If the omega 8500 represents the calibre flagship of the current score of omega movements, then the 9300 can most definitely be considered despite the smaller size the 8520 offers impressive accuracy and reliability. Speedmaster 50th anniversary · speedmaster professional.