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The Good Housekeeping seal was not uncommon on a variety of products of that era, from appliances to hardware to food products. It is provided by the Good Housekeeping Institute, affiliated with the magazine, for over 100 years now, though you don't see it all that often these days. It's an organization that has test facilities kind of like UL or Consumers Union. If they tested and recommended a product manufacturers could license the seal and offer a money-back guarantee for the product. It was mostly a marketing gimmick.
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