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Paul MuchinskyNot to get overly technical, but a very large number of labor unions represented workers in the manufacturing sector. A printers union represented workers who printed paper; it didn't represent metal workers. Each union had its own logo. Most collectors think the presence of the union logo means an item must be vintage. This is true 99% of the time, but not always. Speaking only for pinbacks, it is possible to "fabricate" a union bug on a piece of metal to create the illusion the item is vintage.