Bill,
The metal butt plate is correct, looking through my catalogs I find a catalog with a 'revised price list' dated Jan 2, 1924 listing the gun as having a steel butt plate, one with a price list dated May 8, 1923 still lists rubber, which all the early ones had (two different versions).
Savage bought Steven's in 1920 but they did not use the SVG logo until late 1927 or very early 1928, a price list dated Jan 3, 1928 is the earliest I have found with that logo.
The inspector mark of a number '14' in a circle was used into 1931, in 1931 the design was updated with a 24" octagon barrel and a pistol grip receiver and was then called the Model 71, this change is in material dated Jan 2, 1931.
Your gun would be from 1928~1930. Around 1930~1931 when Hi-Speed 22 ammunition became common they started stamping these guns on the barrel "REGULAR CARTRIDGES" - so be careful what you shot in them, they will not handle Hi-Speed for very long. (yours may have the stamp, some of the last round barrel guns had it and all of the later octagon ones seem to have it).
I think the receiver on your gun has been re-blued, the receivers lost their finish easily and you often find these guns with little finish on the receivers but with most of the finish left on the rest of the gun. The metal these were cast from usually take on an odd color, bronze or purple, when re-blued using modern methods.