The Collaborative International Dictionary of English v.0.48:

tuppence \tuppence\ n.
   1. [contraction from two pence.] A former U.K. silver coin; a
      U.K. bronze decimal coin worth two pennies.

   Syn: twopence
        [WordNet 1.5] Tupperware

WordNet (r) 3.0 (2006):

tuppence
    n 1: a former United Kingdom silver coin; United Kingdom bronze
         decimal coin worth two pennies [syn: twopence,
         tuppence]