Let $B$ be a $p$-block of tame representation type, that is, $p=2$ and the defect groups are dihedral or semidiheral or (generalized) quaternion. These blocks have benne ified recently as algebras, up to Morita equivalence. In this paper we show how these results on algebras determine $l(B), k(B)$, Cartan matrices and decomposition numbers for the blocks. In particular, this gives new proofs of results by Brauer and Olsson.