From the Calgary Coin store on vcoins.com

Denomination : Silver Denarius. Mint : Rome.  
AD 68.
Reference : Sear-2108
Size : 18.1 x 20.0 mm. Weight : 3.68 grams.

Obverse : Head of Galba right, with SER GALBA CAESAR AVG 
around (parts of a few letters are off the flan, but it is 
difficult to find Galba denarii even this well centred.

Reverse : Female figure standing left with an altar at her 
feet, while holding a patera and upside down ship's rudder, 
with SALVS GEN HVMANII around.  The reverse is very well 
centered.
Far above average for a Galba denarius.

        US$ 875  € 692.53
       £ 476.17
       CHF 1070.26
       CAD$ 1104.51

      Rates for 5/19/2005