mystery bottom bracket

TrevorKershaw

Retro Guru
Hi Guys,

I found a bottom bracket in a box in the loft, it's a UN-54. What quality is this, as I can't remember. Is it LX?
 
It is Shimano modern top of the range square taper bottom bracket still used today but called un55 as the plastic cup switched to metal.
It is in a gap is above the old lx models but not quite what xt Xmas
 
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