Celtic Danebury dragon type; below a short description
AR Quarter unit. 

Dragon (or serpent) left, with its head turned back.
Horse. 

Van Arsdell 286; Spink 58; BMC 631-633.

Description by the Celtic coin expert, Mr De Jersey:

This is quite a rare coin – there are only nine examples in 
the online CCI_VA_286 – other references would be Spink’s 
‘Coins of England’ 58, and BMC 631-633. 

Chris Rudd calls the type the ‘Danebury Dragon’ because there is a sort of dragon on the obverse with its head turned back (just heading off the edge of the flan of the coin).

Submitted by Andy Muller, Jan. 2010