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european bb,with threaded converter rings which allow the bb to be fitted into a U.S bb shell'd frame.
Thats a nice bit of kit that
http://martinbike.jalbum.net/Bike%20Builder/Headsets/slides/1983OMASad-800x600.htmlgood pic of the two apart,euro bb and the adaptor ring set.pic courtsey of martin-bike.com.