Jackmountain: What a cool Rifle - best of luck in appraising and selling it.
I have never owned a 52 Sporter but have owned several Target 52's.
Great guns with great accuracy and strong inherent value.
My friend Mike from Tacoma, Washington brought out his minty Model 52 Sporter several years ago and we shot Ground Squirrels with it for three days.
It was like a magic gun - the trigger was so nice and the accuracy so good that it was hard to miss with!
Personally if it were my Rifle I would not have let it out of my gun vault room!
Again good luck with the Rifle.
Hold into the wind
VarmintGuy