Hi Mark, Jeff and everybody:
I would like to contribute to your research for more info regarding the Carrera 1153, a model that IMHO should deserve a bit more spotlight. I always loved the way the dial changes color, as it reflects at different angles, reminding me of (excuse the profanity :) ) the Monaco 1533G's dial.... As for many of these models, the S/N almost disappeared from my model as well. However, challenging my ophthalmic skills and all the magnifiers in the house, I was able to identify three ones and a digit in the front of them that seems like a four. Could it be something like X4111X? Or would it be too early? I hope this does not add more layers of confusion, instead of helping you out.

Finally, a note of thanks to everybody on this forum for making me addicted to this hobby. And BTW, this is the first time that I attach photos and I have no idea if it is going to work....Let's see!!!

Francesco