Polygonal coins have many sides and many facets

Started by <k>, May 21, 2011, 06:48:24 PM

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villa66

What I hoped for. Thanks. These coins were still current the first time I saw one, brought back by a neighbor from a visit. As an American kid who liked our own somewhat chunky nickel--although it was past its prime even then--the big British threepence was an immediate cause for envy.

;) v.

<k>

Quote from: Figleaf on May 21, 2011, 09:25:40 PM
I just remembered that there are square coins of Arab rulers. I wonder why they made them square...

Here is an example: Anonymous silver Almohad dirham (1.52g), Mursiya (Murcía, Southern Spain), no date (around 1160 AD)

Peter

AD 1160. So long ago. The Arabs could still occasionally be innovative in those days.
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Abhay

Quote from: coffeetime on May 21, 2011, 07:17:26 PM
The twelve-sided "threepenny bit" (threepence coin) was my favourite coin when I was a child in 1960s Britain.



So, we have the same choice. The difference being that I like this coin sitting here in India.

Abhay
INVESTING IN YESTERDAY

villa66

#33
Quote from: villa66 on May 21, 2011, 09:19:51 PM
Below is a round 1937 Brazil 2000-reis...there is a 24-sided version of this coin.

Here is Brazil's 24-sided 2000-reis of 1937-38, with this piece being the much more common 1938. There is a point at which the sides of a polygon begin adding up to a circle, and I think maybe with this coin we're beginning to get close.

:) v.

<k>

Quote from: villa66 on May 22, 2011, 04:40:32 AM
There is a point at which the sides of a polygon begin adding up to a circle, and I think maybe with this coin we're beginning to get close.

Yes, I think your 24-sided coin must be the one that gets into the Numismatic Guinness Book of Records.  :D 
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See: The Royal Mint Museum.

<k>

Quote from: engipress on May 22, 2011, 04:33:20 AM
So, we have the same choice. The difference being that I like this coin sitting here in India.

Abhay



So, the threepence has fans all over the world.  ;)

Throughout my life in Britain, we have always had at least one polygonal coin in circulation. The threepence was withdrawn in 1971 when we changed to the decimal system. However, the heptagonal 50p coin was introduced in 1969, to replace the ten shilling note and teach us about (and get us used to) the decimal system. So when the threepence disappeared, we still had another polygonal coin in circulation. The 50p reverse design was created by Christopher Ironside.

In 1982, a new UK circulation coin and denomination was introduced: the 20p coin, which was heptagonal, like the 50p coin. This polygonal coin had a connection with another polygonal coin, the old brass threepence. Both were designed by William Gardner. Look closely at the two images, and you will see his initials, "W G".


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See: The Royal Mint Museum.

chrisild

Quote from: coffeetime on May 21, 2011, 07:13:03 PM
This Tuvalu coin is the only nonagon I can think of.

Guess it depends on what coins one is interested in. ;) All Austrian €5 pieces are nonagonal.

Christian

<k>

#37
In this topic, I am interested in all candidates. Those Austrian coins have fine designs. Because I now restrict myself to circulation coins, I don't have any in my collection. Well, I spent a few minutes in the forum trying to find one to link to, so that you can see how classy they look.  ;)

Haydn commemorative.
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See: The Royal Mint Museum.

Abhay

In India, we have 11 sided coins for all the circulating 2 rupee coins.

Abhay
INVESTING IN YESTERDAY

<k>

Classy.  8) As for other polygons, the first square coins I saw were from India. They fascinated me as much as our threepence intrigued you.
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See: The Royal Mint Museum.

Bimat

Guadeloupe 1 Franc (1903) has 20 sides. :o



Related discussion here.

Aditya
It is our choices...that show what we truly are, far more than our abilities. -J. K. Rowling.

<k>

#41
Quote from: Bimat on May 22, 2011, 06:04:15 PM

Related discussion here.


From which I learnt about the French 25 centimes of 1904-8. If you look very closely, you see that it has 22 sides.
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villa66

#42
After seeing Bimat's excellent Guadeloupe 1903 1-franc, I am going to go do something I've never done: count the sides of the contemporary (1904-05) French 25-centimes.

And I ask, seeing as we've been talking elsewhere of center-holed pennies, what about interior polygons? Cash coins with square holes come immediately to mind, but except for some tokens, I'm drawing a blank as to other shapes.

I go to count.

:) v.

FosseWay

The earliest examples of an intentionally polygonal coin in what is now the UK are the Civil War siege pieces. Below is a diamond-shaped shilling struck by the Royalist defenders of the Nottinghamshire town of Newark in 1645/6 (picture from Tony Clayton's site). There was a ninepence and a half crown in the same 'series', IIRC.



Pontefract in the same situation issued octagonal coins (a shilling in this case):



I share coffeetime's admiration of the UK's heptagonal coins, and I like the 1982-2008 20p the best of our standard circulation coinage since 1971.

When it comes to tokens, there are many more variants to investigate. I have several similar to the one below; it's hard to determine how many sides it's got!



Triangular ones exist, too:



I'm sure I've also got one of a similar shape to the Brookbanks one but which is bimetallic, with the central part being an irregular shape (possibly a letter of the alphabet), but I can't find my record of it to plug it into Google for an image.

Abhay

Quote from: paisepagal on May 22, 2011, 06:19:42 PM
Little surprised you decided to showcase a fake Rs 2 coin ?!

In fact, I inserted the image from the Google Search results. I never noticed that there is something wrong with this coin.

The link to the image is here:

http://surat.olx.in/i-want-to-sell-1990-dr-babasaheb-ambedkar-2-rupee-coin-iid-106448482

Abhay
INVESTING IN YESTERDAY