COIN (ROMAN)
Roman copper alloy coin: As probably of Gaius Caligula (striking for Agrippa), minted in Rome AD37-41, Reece period 1. Die axis 6 o'clock. RIC I c.f p112 no 58. 
Ruler: Caligula
Denomination: As
Material: Copper alloy
Mint: Rome
Obverse: ?Head left of Agrippa wearing rostral crown
Obverse legend: [ ] (F? COS?)]
Reverse: Unclear standing figure, ?Neptune
Dated: 37.0 to 41.0
Weight (g): 7.82
Diameter (mm): 26.0
Parish: Restricted Access
District: Chelmsford
County: Essex
Region: Eastern
Place known as: Little Waltham CP
Discovery method: Metal detector
Notes: Coins of Agrippa are rare in Britian, but it is logical that they be found in the Colchester Region.