Belgium Browning Challenger/Medalist Barrels-5.9"

As I was doing some cleaning and sorting through some items that I had put away in the early 70's, I came across two pistol barrels, new & still in the original boxes.
The one box says International Medalist-5.9" and the second one says Challenger/Nomad-5.9".
I kind of remember when a friend, who knew I liked Challengers and Nomads, brought them back from Belgium in 70 or 71; told me that they were going to be the necessary barrels for anybody shooting in (ISU)International Shooting Union Competition, as the standard 6 3/4" barrel wasn't legal.
But, interestingly enough, both say right on the barrels "Browning Arms Company-Morgan, Utah & Montreal, P.Q.". So this tells me that they were intended for export and not just for European sales.
The 5.9" International Medalist is listed in The Blue Book Of Gun Values, but does anybody know of or have a Challenger or Nomad with the 5.9" barrel?
Email: springcreeknra@yahoo.com