I've moved this thread to the British coin section for you.
"Decus et tutamen" first appeared on English coins abck at the beginning of machine-struck or "milled" coinage, but only on silver coins - gold coins such as the sovereign had milled edges. It appeared on the edge of the silver crowns (a large silver-dolar-sized coin) until the end of the reign of Queen Victoria.
If you're wondering what "ornament and a safeguard" refers to, it's referring to itself. An edge inscription on a coin is both "ornamental" (or decorative), and a "safeguard" against clipping and counterfeiting.
Given the preponderance of fake £1 coins in Britain these days, the "safeguard" aspect is somewhat redundant.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
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