After reading the 1903 threads is it safe to deduce this newly acquired 1903 is a first year production rifle?

24" round barrel, only markings .22 cal. short smokeless ctg., 5-1/2" smooth forearm, straight grip "shotgun" stock w/ flat plastic butt plate, no markings on 3 "groove" magazine, S.N. 36xx

Where can a Savage .22 pump rifle reference book(s) be purchased? Other .22 pump rifle reference books?

Thank you.

bobs1