Jack,
The main difference between the Sterlingworths and the "Graded" A.H. Fox Guns was the name. Mr. Fox didn't want his name associated with a low cost gun. The Sterlingworth action is the same as the Graded guns. FYI, the 16's and 20's were built on the same 20 gauge-size frame. Those small bore Sterlys are ideal for your Partridge!
PS: A 32" Sterlingworth is somewhat rare.
Mark
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