Any idea what this is

[Gary D 76]

I was handed this by a work colleague which had been dug up by her father some years ago. To me it doesn't look like a coin, any ideas.

[seuk 85]

I was handed this by a work colleague which had been dug up by her father some years ago. To me it doesn't look like a coin, any ideas.

Byzantine - something like this:

http://www.ebay.com/itm/11th-Century-Big-Follis-Medieval-Genuine-Ancient-BYZANTINE-Coin-/220925664516?pt=LH_DefaultDomain_0&hash=item3370321d04

[Gary D 76]

I was handed this by a work colleague which had been dug up by her father some years ago. To me it doesn't look like a coin, any ideas.

Byzantine - something like this:

http://www.ebay.com/itm/11th-Century-Big-Follis-Medieval-Genuine-Ancient-BYZANTINE-Coin-/220925664516?pt=LH_DefaultDomain_0&hash=item3370321d04

Does look remarkably similar. The owner dug the coin up about 30 years ago whilst digging a pond in their Cambridge back garden so was quiet deep.