I own a silver spur, worn by my great uncle who was a captain in WWI. The rowel, or spinning part at the back of the spur, is a punctured quarter of Queen Victoria.
I also own a slide rule that I used in University in the 50s, and as a geologist in the 60s.
I also own one of the first calculators. It was made by Commodore and cost me $ 350.00...something you can buy today for $5.00.
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