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In 1946 the 38-55 had been dropped from regular production by Winchester, however, parts were still in the bins on the production line. The rifle of interest was assembled from whatever parts were found (available) with two possible reasons, it was a special order, or the rifle was assembled to clear the assembly bin of the extra parts (remember, Winchester never discarded anything that could be used)
The two barrel bands probably was a quick and easy way to fill the two holes for the old style (front) and the new style (behind the ramp) locations. The barrel had the old style hole or groove for the band screw and the mag tube had the new style groove. Cutting two more screw grooves would be easier than filling grooves and re-bluing the parts.
Just a simi-educated guess.
