I went to school in Guildford for seven years and it's always been a special place to me. I buy the occasional postcard of my old school and some can be seen here:
But, more recently, I managed to acquire a token of Guildford. The obverse features a woolsack in the centre with IOHN MARTIN around whereas the reverse features the castle with IN GILFORD 1652 around. This piece is ex. Norweb and cost me the princely sum of £6.
Here's some more information about John Martin: