Stunning, tiny, unknown silver coin found Friday afternoon in England!

[Ia.FurTrade]

Was in England metal detecting last week & hadn't made many great finds. ( Just got back to Iowa last night! ) Was just leaving the field for the last time & heading for the van when I got a 12-47 signal on the E-trac.......figured it was another "greenie" big penny but couldn't find it at first but finally a tiny silver colored thick disc fell out of a handfull of dirt. I could hardly believe that tiny piece could give that high signal! I picked it up & could see strange markings on the front & back & that it was very thick & appeared to be a hi-grade silver. Called the other guys over & they had never seen anything like it either, but we're pretty sure it is a coin & possibly Saxon or Celtic but couldn't find anything like it in the books we had.
It is only 9.2 mm diameter & weighs 1.76 grams. Off to the museum it goes for ID & recording!
Anyone has any info I would appreciate finding out what it is!

Iowa Dale

 

[BuckleBoy]

Neat find, and a fantastic ID from Bramblefind!