I thought it was a Brush Model, but there's a screw/tang interface that is significantly different than the pictures of a Brush.
I think now that it's a Skeet and Upland Game. There is also an opinion that it was re-barrled, but the Skeet and Upland Game had a 26" barrel, and ejectors as an upgrade option.
When Fox called their Sterlingworth a "Brush, Standard, Field or Trap" They were classifying them by barrel length only. Brush models have 26 inch barrels Trap models have 32 inch barrels. Other than that a Sterlingworth is a Sterlingworth essentially unchanged from their introduction to the end of production with minor changes to the forend wood design and top lever which occurred later in the Savage era. Skeet and Upland guns are a whole different sub-set with specific stock configuration which is different from the standard Fox semi-pistol grip design. Ejectors, recoil pads, custom stock dimensions and center beads were offered as extra cost options on all Fox guns.
