Found in Britain no Way it would be found in the US if you like I can give the ruler at a the time I believe it was made... Okay here's some info you may be able to make sense of because I honestly know nothing about coins...
AETHELRED 11 [978-1016] silver penny
Long Cross type
WATCHET mint - Moneyer - HUNWINE
obv. +AEDELRED REX ANGLO
rev. +HVNEPINE M'O PECED
Only 10 recorded in EMC/SCBI - all in museum collections
Also I have my suspicions this coin is fake, but I thought it may be worth checking.