Introduced in 1999, the Speedmaster has a steel case resembling the X-33. Ref. 3540.50.00 features a carbon(-like?) dial. Though listed as a 'Special Series', it was not strictly limited.
Movement Type
Manual
Caliber
3600Jewels
64
Reserve
504
Frequency
18000
Hands
No Seconds
Shape
Round
Lug Distance
20.00 mm
Material
Stainless Steel
Glass
Sapphire
Thickness
16.10 mm
Diameter
43.30 mm
Water Resistance
100.00 m
Dial Color
Black
Material
Bracelet
