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This display case was part of a recent eBay purchase. The reference to 'microsonic' is somthing I have not seen before. A Google search suggests microsonic was an advertising description of the hum the newly introduced 214 movement emitted. I found the earliest reference to be an October 25, 1960 article that stated "First insturment of the space age you can wear and use! First microsonic timepiece...It doesn't even tick. It hums!" Any additional infromation from members will be appreciated.:biggrin: