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The Specialized forks taper go from 38.5mm to 45mm to 52mm.
Sure? 38.5mm is 1.5 inch, that wouldn't really make any sense..
Edit: pictures really helped.I've been looking at the specialized fork and the red paint line doesn't seem to be horizontal. It looks like some proprietary specialized design where the headtube extends past the headset.. So it would fit into your bike just like in your first picture, with a black part sticking out from under your headtube.
I think it's sort of a integrated crown race design to save weight. You can really see it when you google pictures of the new Roubaix headtube/fork area. The bearings sit higher than where the headtube ends.
Jaap-
Mystery Solved
I did a bit more research and I understand that the forks are from a 2016 S-Works Tarmac Disc which happens to have a proprietary steerer...
FORK: Specialized FACT carbon, full monocoque, size-specific taper, disc mount
HEADSET: 1-1/8"" upper, size-specific lower, stainless steel cartridge bearings, carbon top cap
Vince
The tick is for the fork offset which is 45mm.
The bearing is 52mm diameter external.
The Specialized forks taper go from 38.5mm to 45mm to 52mm.