Jim, I have two Rangers in 16 ga. and they both have that stamped on the barrels.
Chris, I have a Sears double barrel single no selective trigger, ventilated rib that is also a Fox Model B that has 101.7 stamped on the receiver and that is all. No serial number. I/my parents bought the gun for me at a Sears store for $89 when I was 15 and still have it.