Marine chronometer; Russia, 1980. Carved medea and metal. Preserves documentation. Measurements: 19 x 19 x 19 cm. It is a traditional type chronometer (circular brass plates, with snail of force and transmission by chain, it has a balance wheel mounted on plate and chronometer escapement). It has a normal open bimetallic balance wheel, with a cylindrical balance-spring and thermal and running (oscillation) regulation nuts.