Just to add to this, UC links fit on case number 869119/** (the grey dial) and UW fit on the other case (the black dial, unfortunately only some of the numbers are visible). They are not interchangeable, UW are 18mm and UC is a little smaller, about 17.5mm.
The grey dial is circa 67-68 and the black dial is 1970.
*if anyone has the case number for the one with the black dial please let me know*
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