I think because it is too hard to pin down a production date, slabbing wouldn’t be feasible. Like there’s that white on brown STL Browns pennant with the brownie ... you see it on eBay every now and then usually advertised as original, but it is without question 1970s stock. Repro? But there wasn’t a pennant ever that looked like this. .... Also as someone wrote earlier there is plenty of variability in size, if they would treat this like off centered cards then they could go jump in a lake.
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