@antedeluvian - yep I remember them, remember some of the old ones were silver in colour - made of a nickel alloy I think. As far as I know Zim does not even use coins now.
We used to call payphones "Tickey-boxes" as they accepted a minimum of 3d for a call. It would also buy you an ice lolly - hence we called them "tickey lollies".
"Sixpence" and "Tickey" were also widely used first names among the African population...
Guineas where used in auction houses. When an item was priced at "10 guineas", the buyer paid 10 guineas, but the seller received 10 pounds. The 5% difference was the auctioneers fee.
As far as I know, horse auctions still often use guineas in their prices. (And the horses' heights are measured in hands!)
I remember doing endless exercises at school involving pounds (currency), shillings, pence, pounds (weight), ounces, pints, fluid ounces, quarts and gallons. Life was fun in those days!
And as well as being called a "Thatcher", I remember people calling it a "Scargill" (after the firebrand trade unionist) because it was hard, brassy and a weight in the tax payers pocket. A fify pence piece (half a pound), then became an "Arfur Scargill".
"It would also help to have it gray on the front and green on the back."
I don't know if other countries do it, but Canada has managed to produce quarters with different colours. I have seen them with red and blue, but googling promises some with multiple colours like this blus jay (http://www.google.ca/search?q=canadian+quarter+with+blue&hl=en&tbo=u&tbm=isch&source=univ&sa=X&ei=0-UjUYpQj9XSAf2ugbgN&sqi=2&ved=0CDcQsAQ&biw=1294&bih=811#imgrc=UTfuTP9J90W2dM%3A%3BpVBTOYmE5Qqb5M%3Bhttp%253A%252F%252Fwww.talismancoins.com%252Fcatalog%252FCanada_2010_Blue_Jay_Quarter_Pkg.jpg%3Bhttp%253A%252F%252Fwww.talismancoins.com%252Fservlet%252FDetail%253Fno%253D1268%3B563%3B600) or one that even glows in the dark (http://www.dailymail.co.uk/news/article-2129084/Canada-rolls-new-dinosaur-quarter--glows-dark.html). I have yet to see either of those two.
I always thought that "bob" was Southern African- shows you!. The boy scouts used to fund raise by offering their services for "bob-a-job". We used to call the "threpny bit" a tickey. Doubled well as a makeshift screwdriver! There was a "little person" clown at the circus who called himself "Tickey".
Drones are, in essence, flying autonomous vehicles. Pros and cons surrounding drones today might well foreshadow the debate over the development of self-driving cars. In the context of a strongly regulated aviation industry, "self-flying" drones pose a fresh challenge. How safe is it to fly drones in different environments? Should drones be required for visual line of sight – as are piloted airplanes? Join EE Times' Junko Yoshida as she moderates a panel of drone experts.