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FWIW, Browning introduced the 16-1/2" long Supertubes in 1965, for multi-gauge Skeet shooters.
Browning Supertubes should have the Browning name, or the gun's SN, marked on them.
If the tubes are full-length, but have either the Browning name or the gun's SN, then it's possible they were from when Browning was experimenting with the idea.
If the tubes are longer then 16-1/2", and/or unmarked, they were most likely made as an aftermarket addition by Purbaugh (Claude Purbaugh, Calif), long before Briley and/or Kolar were making tube sets.
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