Good post, Pablo.
But what's that symbol just below 9 o'clock on that coin?
The text on the coin means "By the Grace of God, King of Spain and the West Indies."
The symbol just below 9 o'clock is the assayer's monogram.
Here is another coin featuring a different monogram.
8R means "Ocho Reales".
The last 2 initials are related to the current king name, or something like that.
The symbol just below 9 o'clock is the mint mark. For the first coin it is a Potosí monogram; for the second it is the Mo abbreviation for Mexico City. The last two initials belong to the assayers.
If I say my rate is $80 per hour, they say, "What! I can get some young guy to do it for half that price!" At which point, should I refer them to you? :-)
Too bad you can't just put them in front of a computer with font editing software and say, "Or you could do it yourself, for nothing!"
As for that old coin:
From what I understand, centuries ago in my country (the U.S.), not only did they use those old Spanish coins and call them "dollars", they used to make change with a hacksaw!!
Not a hacksaw: nippers. Too much silver would have been lost using a saw, which produces shavings.
FYI, “Pieces of Eight” were pieces of the 8 real coin, nipped into eighths, quarters or halves.
Hence the term "2 bits" for 25¢. That is, 2 of the pieces of a Real that had been cut into eighths.
A little more info:
The text in the ribbons used to say: "Plus Ultra" (Latin for "further beyond").
The motto was used to encourage Spanish sailors to disregard ancient Greek Mythology warnings about the Pillars of Hercules, and send them to explore the new world.
Thus, the two vertical lines represent the Pillars of Hercules. And the s-shaped ribbon represent the desire to go beyond limits and conquer the world.