From what I can see in the pictures, it is a 52B that has been drilled & tapped on the receiver in order to mount the scope. B models were never drilled & tapped on the receiver when they left the factory. Also it is missing its Lyman 48F receiver sight that most had when they left Winchester. The drilling and tapping and the absence of the 48F lower the value as far as a collector rifle goes. Rifles like this typically sell in the $2500-$2700 range. Can't see clearly enough to tell if there are two tapped holes in the barrel for a target scope block or not, on the plus side it appears to have its original sling. Of note is the fact that drill & tap for scope may have been an option from the factory as well option of no receiver sight. Winchester offered other receiver sight options but by far most Sporters you'll encounter will have the Lyman 48F with target knobs. Since factory records for rifles from this time period do not exist it is hard to prove what options a given rifle may have had, a sales receipt listing options would be better than nothing but not as well accepted as factory records. I would purchase that rifle as a shooter and enjoy it as it was intended to be and not bank on it appreciating in value nor having any collector value.
Im a 52 LOVER and Mr Gunswizard pretty much covered it all! he and I are on the same thought on money as well , its a 2500 gun but the owner prob wants 5K, we used to say the extra holes hurt a 100 a hole, on that gun I would say 250 to 300 per hole! Buy it right and you will have the best shooter , with the most class on the block! Shoot tree rats in the eye with class and style!!!! I had a 52C Sporter, I just could not hand it to my nephew and say go have fun!!! sold it for 5500. the very best WinPoor
EDIT, I have a HB Zanders satin that I kept to hunt with, tack driver, Winchester had the Japs make 500 for Zanders, 250 gloss and 250 satin, We call them 52R meaning repros. mine is a shooting SOB, one day Im having a high dollar barrel of same heavy contour made and fitted, chambered with the Winchester 52D reamer and rust blued! NO made in Japan stamp!!!! the very best WinPoor