Cane Creek 40 Headset.
Bought some forks and they came with two headsets.
Unused and in original packaging. This one comes without the crown race.
Info from the Cane Creek site:
.41mm angular contact bearings feature 36degree inner chamfer, 45degree outer (36/45)
.Directly compatible with 41mm head-tube and fits 42mm (Italian) head-tube with supplied 0.25mm shim
.Integrated (IS) assemblies feature chamfers molded inside the head-tube with no press-in cups
.9mm stack height (short) top cover