Meaning of "SA Grade" in 1962 brochure for 513T Matchmaster

[nambujim]

A long time back I had "several" 513's and from my fading memory I believe the SA was the "sport model" and unlike other versions mine had a 24" tapered barrel..........was marked on the Barrel Matchmaster Model 513SA, it also had a factory ramp/hood front sight, sporting checkered stock, and front/rear mounted sling swivel studs like for use with a hook type sling. It looked a lot like and was probably marketed to compete with the Winchester 75 sporter. Hope this helps but my opinion of this particular rifle was such I traded it for a 75 Sporter but both are somewhat rare and difficult to find. One last thing, I believe the SA version weighed in at about 6# so it was far lighter in weight than the other versions. I don't have one that dates that far back but the old Gun Digest and Shooters Bible from the 50's, 60's, 70's............and even before make good reference material when trying to find info on rifles from that period...............and Hey! look what I found on the internet, a picture of one!