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The one I got today is a Crown .. The reverse looks like a old guy riding a horse .. riding over a dragon .. or something
This design is much the same as the one used on the gold coinage. It is St George, patron saint of England, slaying the dragon. The design was made by Italian medallist Benedetto Pistrucci.
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Were sovereigns ever in circulation? I know they have a nominal value of £1 but I don't think they were ever used as currency, were they?
Yes indeed they were. As Mr T said, it was mainly prior to WWI. From 1897 to 1918, copper farthings were deliberately blackened prior to leaving the mint, to prevent them from easily being confused with half-sovereigns or sovereigns in circulation.
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