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CCD BVI photometry of the faint open clusters Berkeley~73, Berkeley~75 andBerkeley~25 are presented. The two latter are previously unstudied clusters toour knowledge. While Berkeley~73 is found to be of intermediate-age (about 1.5Gyr old), Berkeley~75 and Berkeley~25 are two old clusters, with ages largerthan 3.0 Gyr. We provide also estimates of the clusters size. Veryinterestingly, all these clusters turn out to lie far away from the GalacticCenter, at $R_{GC} \geq$ 16 kpc, and quite high onto the Galactic plane, at$|Z_{\odot}| \geq 1.5$ kpc. They are therefore important targets to probe theproperties of the structure of the Galaxy in this direction, where the CanisMajor over-density has been recently discovered to be located.Comment: 8 pages, 10 figures, in press in A&

A photometric study of the old open clusters Berkeley 73, Berkeley 75 and Berkeley 25