Long shot: Stack height Speeder Road Champion headset

[Gazelleer]

I was wondering if anyone knows or is able to measure the stack height of a Speeder Road Champion headset?
These were used on (late) '70s, low end Gazelle Champion Mondials, for example.

 

[Elev12k]

I would ask Stumpjumper1990. He finished his Concorde MTB recently and it has a Colnago branded headset. I think it is a Speeder Road Champion in disguise.

http://www.retrobike.co.uk/forum/viewtopic.php?t=158456