[Exhibitman]

True market cornering, no. Closest I came was trying to get every 1928 Exhibit of my cousin that came up for sale but I quit after 8:










I've let a few slip past since.

Since 1 of 1 specimens are pretty regular occurrences in boxing, soccer and other global sports, especially from foreign issuers, in a sense anyone who collects actively in those areas has some markets cornered. For example, this is the only known specimen of a 1904 Sporting Life cabinet from the Jeffries-Munroe title fight:



This is the only known example of the 1938 NX5 American Sweets Joe Louis:



I don't know of any other complete runs of these:



Can't be too many of these floating around, either: