Miguel,

Your 720 was "The" touring bike "back when" and you have a history w/ it, sunset say I.

There is nothing on today's market that will ride like your 531 standard gauge long wheelbase 720, a rando build would be nice as Vintage suggests. Modern drivetrain, brake pads & fresh wheels you'd have a light, smooth, well mannered elegant long distance machine. A fresh paint job and into the sunset you go, with style.

-Bandera