Rear spacing is a clue
126/7 and its pre 92/3
The word Master and the paint suggest "homage" to Colnago Masters which started in...what...86
Can't make out the tubing from the pic
PX10 was their pro bike. Like wot Mr Simpson rode. Which then became PXN10
around the late 70s. N being 'nouveau' maybe?
So hmmm looking at your fork crown and the parts I don't think it's a top one. Cranks are budget as are brakes
Shimano Crane was not put on Pugs. But anyone could have done that.
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