From WordNet (r) 2.0 (August 2003) [wn]:
keepsake
n : something of sentimental value [syn: souvenir, token,
relic]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Keepsake \Keep"sake`\, n.
Anything kept, or given to be kept, for the sake of the
giver; a token of friendship.
[1913 Webster]