U.K. 1957 Sixpence!

One of three sixpence coins I have and this is the only copper-nickel one. So far, shillings are the most common pre-decimal coins I have, and it's not hard to see why. This coin is much more interesting than one of those boring old shillings, and has a much better design, too. As you can see, this one's was improperly metal content was improperly mixed leaving some streaking visible.

Now here are some interesting facts about the sixpence coin (from Wikipedia):
"As the supply of silver threepence coins slowly disappeared, sixpences replaced them as the coins put into Christmas puddings; children would hope to be the lucky one to find the sixpence, no doubt also encouraging them to eat more pudding.
They have also been seen as a lucky charm for brides. There is an old rhyme which goes "Something old, something new / Something borrowed, something blue / And a sixpence for her (left) shoe."

The above coin would have been worth 2.5 New Pence back in the day or 28 of today's pence. But that's not much compared to its $0.75 numismatic value.