Here we have the other pre-Carrera reference 2444T, again with a tachymeter. But here, the tachy scale is
link rendered
link in a bold red, something we'll see in the Carrera
link too. While the 2444 is a three-register chronograph like the 2447 that'd come soon after, it still has different lugs and other design queues that set it apart as decidedly '50s.
link