The steel used for the actions varied Sterly v. Graded Fox guns - even when they were being made in Philly. Barrel steels also varied (Chromox (which may be the same material as 'Steringworth Special Steel') , Krupp, Whitworth). Forend attachments could be snap on or Deeley. Wood varied from wretched to very nice. After Gough took over the engraving was poor, even on the graded guns (the C grade guns being, perhaps, the best).
Generally, the Philly guns were much better made than the Utica guns in materials, fit, finish and configuration options from the factory. For instance, if you ordered a gun from Fox (in Philly) the specifications for weight, barrel length, LOP, style and size of grip, chokes, etc were almost unlimited. Utica not so much.
If you handle enough of these guns the differences become apparent.
