Dr No[Moderator Omega - Wristscan]
37744
Mine are . . .
. . . Karree perpetuals, which ended their production run six years ago. The next version of the Karree perpetual . . .

. . . not only had a different case design, but also shared the aperture lay-out of the Senator perpetuals, with day and month closer to the periphery than the center of the dial.
Finding one like mine at a dealer would be difficult; the later version is somewhat less difficult to source, but also out of production for at least two years.
There are several variations currently available, including one in ceramic . . .

. . . that would be my choice if I were limited to just one.