The Omega Speedmaster Perpetual Calendar, limited to 50 pieces, was made for Japan in 1991 to mark Switzerland's 700th anniversary. Powered by caliber 1160, it has a 39mm yellow gold case. It came with either a yellow gold bracelet or brown alligator strap; though the main image is from Omega, the strap is thought not to be original.
Shape
Round
Lug Distance
18.00 mm
Material
Yellow Gold
Glass
Sapphire
Diameter
39.00 mm
Water Resistance
100.00 m
Dial Color
Silver