Great find! What is the serial number? (The first digit after the initial letter MAY be the last digit of the year of manufacture. My 1980 PKN-10 had a B0**** number.)
I loved the geometry and road manners, and my only gripe was the haphazard craftsmanship, with brazing voids at the rear dropouts and ugly seams down the backs of the fork blades. Your PXN-10 would not have the latter, of course, since it would have a full Reynolds 531 fork.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069