What is the value of a 1773 Georgius III Rex coin with no clear
denomination on it.  It is some sort of alloy which has a nice ring to
it. It is approximately 1 3/8 inches is diameter and is thinner than
an American quarter.  The head side has a picture of King George III:
the reverse side has a skirted figure, Britan  nia, and the date 1773.

Hello diggercoin: 

It is possible you have yourself a Virginia Halfpenny. The Coin Doc
describes it as the following:

Archive #36   
URL: http://www.coinsite.com/content/cdanswers/cdarchive36.asp
Quote: "You may have a Virginia Halfpenny. These were authorized by
England for Virginia in 1773. The obverse shows the head of King
George III facing right, the legend GEORGIVS III REX (George III King)
is around.  The reverse shows a large crown, with 17 and 73 on either
side, over a shield with lions, fleur de leis, harp and horses in
quadrants.  The word, starting on the right side is VIRGI and on the
left side is NIA.  Ciculated examples range in value from
approximately $50 - $350."

Is it possible that your are mistaking the shield on the back for a
"skirted figure"? If not, let me know more details (using the
Clarification Request feature) about the coin (like in which country
you found it) and I'll continue looking.

Thanks. 

websearcher-ga

Search Strategy (on Google): 

"King George III" coin 1773
"Georgius III rex" 1773
"Georgivs III rex" 1773

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Clarification of Answer by websearcher-ga on 12 Jun 2003 11:00 PDT

Hi diggercoin:

Please disregard my previous posting - it was completely off-base! 

I think what you have is a Colonial George III Copper (halfpenny).
Have a look at:

GB/Colonial George III Copper 1773 1/2d
http://www.historyincoins.com/xxx-6-5-2-21.jpg

Is this it? The size seems to be right compared to the penny next to
it.

If so, it is worth approximately £18, as can be seen from:

George III (1760-1820) 
URL: http://www.bottles.freeserve.co.uk/George-III.htm
(Scroll down to the halfpenny section.)

Of course, you need to be aware of forgeries in this coin. 

Contempory Counterfeit
http://www.historyincoins.com/xxx-26-8-2-3.jpg

However, according to the following page, the counterfeit may be worth
more than the "real" coin!

"Contemporary Forgeries"
URL: http://www.bottles.freeserve.co.uk/Contemporary-Forgeries.htm
Quote: "WG-1214: GB George III 1773 Contemporary Counterfeit. Good
grade & Die Axis way out. £49"

Sorry for any previous confusion on my part. 

websearcher-ga