Omega Speedmaster Professional cal. 321 ref 105012-66 CB s.n. 25.443.xxx bracelet 1039/516 Delivered 1st November 1967 Mexico
The particularity of the CB case is the ‘flat’ inner/top section of the helical lugs. It is belived that only HF had the brevets to fully ‘twist’ the lug so it is speculated amongst collectors that CB would ‘shave’ the top off in order to achieve the twisted lug aesthetic. The manufacturer was commissioned to produce a batch only in 1966, probably because their production was ‘defective’ making it highly collectible today.