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Glitter cards cause injury to the employee? What would they do, hold them over their eyeballs and shake?
We don't know just how far over-board the glitterer went; the grit might have been writ large.
I read, In The Great Somewhere, that a postal employee's arm was infected ... a much bigger deal back then. Maybe somebody did not wash their hands with soap & water after using the bathroom, or after getting a scratch.
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It seems these embossed cards were not seen much after 1920 or so.
Remember the Great Shift: before The Great War, an oft-estimated 75% of postcards being sold in the US were being produced in DE. Those imports stopped. During the war, the penny postcard rate went from 1c to 2c. These events combined to end what we now call The Golden Era of postcards.
The German postcard printers clearly had the embossing technology worked-out, eg, a separate roller in their printing presses, competent machinists at the ready to make that mould, etc.
The American postcard printers who took-up the post-war slack may have chosen to eschew that investment, and compete on cost ... never mind that Mr Ford was after those machinists.
Cheers,
/s/ ikeyPikey