Vintage 1950s (?) Chrono ID Help

Hello... I picked this Pre Carrera chrono up at a sale about 6 months ago. I’ve been trying to identity it since then and haven’t found a similar watch.

I’m guessing it is a 1950s version. I have found several examples with the same case (38mm), lug and pusher set up but in the three register variation.

As far as I can tell the dial looks original.

The bridge does look to have been replaced at some point. It is not signed and metal has a different hue from rest of movement.

Any help would be much appreciated. Thanks in advance.

-Bill

Dial Looks as if it has had a relume at some point, but not totally sure. Caseback looks a tad odd from what ive seen, but I am by no means an expert on these, so cant say with too much certainty.