An outstanding example with clear and sharp lettering on the zinc (TRADE MARK THE MASON DISK PROTECTOR CAP PATd NOV 30 1880), no metal corrosion, and no damage at all to the milk glass immerser section. Fits standard mouth pint, quart or half gallon Mason jars.

This item is from the Darryl Pearson collection. 

est 75-150

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