Were BVG's actual words "cannot tell if its authentic."? I know the vintage graders at Beckett well enough and they are all very adept at identifying doctored and authentic cards and a Gehrig of any issue is not beyond their capabilities. Guessing you still have the card and Beckett's documentation? Just for my own education and curiosity, it would be great to see either or both.
Twitter: @Coimbre21 - Collecting Carl Yastrzemski Topps, Jimmie Foxx, 1966 Topps Venezuelan, 2010 Topps Tribute HOF Relics & Autos, L.A. Rams Autos