I had a Marlin 39 that was handed down to me from my Dad, and my son now owns it due to my bad eyes. My Dad owned it second-hand or so in the 60's. As with kitchen table/home workshop gunsmiths of that era, everything had to be brought up to 60's standards to include refinishing all of the wood with BC Tru-Oil or similar and polishing most of the metal with a buffing wheel. Thankfully he only buffed out the receiver, the buttplate, and the fore-end cap and left the barrel alone. He installed a big 4x scope on it.
That was the day.
I wish he had just left it be, but alas.
Any original Model 39 with a S/N prefix with an "S" denotes a rifle that was not designed to fire High Speed ammunition, only standard/target velocity ammo.
In 1932, all Model 39 rifles were fitted with a High Speed bolt and the S/N prefix was "HS".
All of my documentation on this rifle was given to my son, and I cannot recall the S/N, but I do remember it was made in 1928. Yours must have been produced much earlier.
And, pics would be much appreciated, sir.
http://www.thetruthaboutguns.com/2012/01/chris-dumm/classic-gun-review-marlin-model-39/
If I were you, I would either keep it and shoot it, or find a savvy friend that would educate you insofar as how much fun shooting this rifle would be.
It is one damn fine rifle.
Jim