I tend not to double up on cards unless it's something I truly love. However, the beauty within the T206 set is that even if two cards possess the same back there can still be something interesting or unique about one of them that essentially makes them two totally different cards worth pursuing. The below is a prime example of that theory put into practice:
I already own a Tolstoi back that I purchased through Memory Lane a few years ago but when I spotted this Tolstoi back with a partial double-name at the top in an REA auction I decided to make a legit run at it.