-I never trust scans for this sort of determination. A couple points that i hope are helpful:
~Some of the 49's (a very small percentage) containing red lines are said to be authentic, but i've never seen a Ruth that turned out to be.
~An in-person exam should focus on the feel of the card, blacklight comparison to known originals, and the tone and coloration of the jersey versus the border of the card.
Those are the only hallmarks i know of for this card, it's been years since i looked into it.
lobo_hacker, hoping to acquire a Stan Musial from this set one day