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@Tea_Bee
I also took the front end apart and found the only distinguishing mark on the entire bike, which is "Akisu 80" stamped on the fork steerer tube. Google says they are a Taiwanese manufacturers of f&f which were rebadged for other people. Well made, but definitely lower end, seems to be the suggestion, which fits with the rest of the frame detail.
In servicing the fork, I prised the crown race off and found it was a nightmare of a job, it was jammed on harder than any other I've dealt with before. Then found I couldn't get it back on. At all. So I ran a file around the inside of the race and just a teeny bit around the base of the steerer tube.
Checking on Sheldon (http://www.sheldonbrown.com/headsets.html), it looks like this is a JIS fork (27mm at the crown race area) with an ISO headset (26.4mm internal diameter) jammed onto it.