Breguet caliber 558SQ1

Brand:Breguet
Reference:558SQ1
Movement:Handwound
Display:Analog
Diameter:29.90
Jewels:21
Reserve:50
Frequency:18000
Hands:Hours, Minutes, Small Seconds
Additionals:Tourbillon Escapement, Skeleton
Breguet caliber 558SQ1

558SQ1 description

Hand wound movement, engraved by hand. Running seconds on the tourbillon shaft. Compensating balance spring with Breguet overcoil.

Pictured from dial side.