1878-1881 AD., Great Britain, George III spade guinea type Brass Token or Gaming Counter, by Iliffe & Gardner, Birmingham, dated 1701.

Great Britain, George III spade guinea type counter, by George Yorke Iliffe and Frederick Gardiner, diesinkers, 96 Suffolk Street, Birmingham, dated 1701 AD., struck between 1878 and 1881,
Brass Token, Gaming counter (25 mm / 3,51 g),
Obv.: GEORGIUS III DEI GRATIA. , bust of George III right.
Rev.: G. Y. I. ET. F. G. REX. S. UF. ST. DS. T. M. S. ET. / 1701 , around crowned shield. The shield is divided into four sections, representing Ireland, Scotland, Wales and England.
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A gaming token, made to resemble a George III guineau, which was made of gold. A true guinea ought to weigh 8.4 grams, and a half-guinea 4.2g.

Starting after the date, these initials stand for George Yorke Iliffe and Frederick Gardiner, Suffolk Street, Die Sinkers, Tool Makers etc. The REX was thrown in to make it look semi-authentic. These were written up in an article on bogus guineas and other fantasy coins in COIN Monthly back in the early 1980s.

a comparison with the original coins on http://blog.mikerendell.com/?p=4964