I am almost sure that it is an Orlik hand cut stem - the same cut as on my Old Bond Street and Orlik Supreme briars.
I have two Bewlays with those stems. A x24 blast Sansegal and a 010X blast giant and I have always taken them as Orliks.
I also have a 159 Standard with a moulded stem which I think are made by Comoy, because of the waternose on the peg.