Posted By:
Scott ElkinsI have only seen and/or heard of three Old Mill Overprints (just as Frank). I also believe they are printing errors, but extremely rare - 3-4 times as rare as a Ty Cobb back! This is the only back from T206, T205 and T207 that I never owned - I never even saw one for sale to get outbid on! I would guess that if one becomes available, it should fetch around $10k at least in any condition - maybe more, since T206's are so popular. T207 Red Cross backs are in the same rarity league as these overprints. However, we all know that T207's are not as widely collected as T206's and the Red Cross backs usually bring around the $10k range with the juice.