Hope Headset F - Bottom - 1.5 Traditional EC 49/40 - Blue
Part of the Hope Pick and Mix headset range - choose your top and bottom cups to get the combination you require.
This one is the Hope Headset HSCFR - Bottom - 1.5 Traditional 49.57 diameter
The stack height of this cup is 14mm
Colour: Blue (also available in Red, Silver, Black)
Replaceable sealed bearings - so next time you won't need the whole headset, just the bearings.
Not sure if this is the right headset part - check out the Hope headset technical guide on the downloads tab.