I don’t know the set, but part of the explanation may be that the set was issued over several years. Catalogs in the past were too quick to assign a year to a set. A prime example is the Mayo baseball set, which in fact was issued over two years. Cameo Pepsin pins were also a two year (at least) issue. I also believe that California League SF Hesses (the photographic ones) were issued over two years.
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