I’ve heard that before the larger PSA holders were available, the only way to get the larger full boxes slabbed was to cut off the flaps on one side.
Not sure if that comes into play here, but I’ve heard of other situations where it did.
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Trying to wrap up my master mays set, with just a few left:
1963 Post complete panel
1968 American Oil left side
1971 Bazooka numbered complete panel
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