Abstract: The small-sized electronic timepiece comprises a casing susceptible to turn ntirely on itself in a support in order to expose in a first position an analog display and in a second position a digital display. The support is constituted by a rectangular plate two opposed edges of which have upwardly extending wing portion, the wristband or any other fastening system being fixed in the neighborhood of said wing portions. The casing is adapted to slide parallel to said wing portions from one edge to the other of the plate and to effect its turning movement in at least a third extreme position, the latter permitting an easier replacement of an energy source.