Xchisles, I have seen Baker L Grade and De Luxe with Whitworth barrels. Also Syracuse Arms D Grade, Smith A2 and higher, Lefever Optimus. All of these were made after the turn of the century. I have an 1887 Lefever catalog [my date mark] offering Kilby or Whitworth for the Optimus. An 1889 Catalog has the same offering. If my memory is correct, Parker offered Whitworth beginning sometime in the mid 1890s.

http://www.bakercollectors.com/