  This is an expository presentation of a completely integrable Hamiltonian
system of Clebsch top under a special condition introduced by Weber. After a
brief account on the geometric setting of the system, the structure of the
Poisson commuting first integrals is discussed following the methods by Magri
and Skrypnyk. Introducing supplementary coordinates, a geometric connection to
Kummer surfaces, a typical class of K3 surfaces, is mentioned and also the
system is linearized on the Jacobian of a hyperelliptic curve of genus two
determined by the system. Further some special solutions contained in some
vector subspace are discussed. Finally, an explicit computation of the
action-angle coordinates is introduced.
