Mike -- Claudius, Roman emperor 41 to 54AD. The one in my picture sold for $46 US dollars.

Here is its auction description ("As" is the type of coin, "AE" means "made of base metal, not gold or silver"):

Naville Numismatics Ltd. - Auction 70, Lot 410
Claudius, 41-54 As Rome circa 41-50 (?), Æ 30.20 mm., 10.26 g. Bare head l. Rev. Minerva advancing r., hurling javelin and holding shield. C –. RIC 100. About Very fine Starting price: 30 GBP...