Bought this one a few years ago. Needed a bit of help because it was loose where the head of the stock met the action. Dan Rossiter took care of that for me. In the process I had him blacken the 28" barrels and take out one dent. Chokes are .011 and .033.
This is one of the early ones marked "Sterlingworth Co" on the frame and the barrels. Dan also refinished the stock because the head was oil soaked. Finally had him add a NOS recoil pad and an Ivory bead.
I normally go through Foxes like a hot knife thru butter, but this one might be a keeper for grouse as a shooter. Gun weights 6 lb 12 oz. Min barrel wall thickness is .025 and that's way down towards the end. Drop a Heel is 2.5" and LOP is 14 1/8" to the end of the Pad. Little short, but at the end of the season with heavier clothes it won't matter much.
A few pics:
Sterlingworth Pin/Grouse Gun
Threaded Mode