I owned a E98 Old Put Cobb, and for a few years that card was the pride of my collection. At the time we thought Old Put stamps were found on E98 cards with red backgrounds only. Then one day, we see the Old Put overprint on E98 cards with blue backgrounds, and at that point, I became completely uncomfortable with the aftermarket overprints.
Everyone can collect whatever they are comfortable with. The overprint cards are still interesting cards, but I am personally going to stay away from all overprints that were stamped after the actual production process. Just my opinion and to each his own.
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