Help on a 40's Rolex precision

The watch is, the bracelet, no. The mechanism in the watch was produced by Aegler in Switzerland. The firm was associated with Rolex and Gruen. That movement was produced in a number of grades, and it was used in many different models. My guess is that it would be from the 1940s or early 1950s. Case is marked 18 karat (.750). I have a watch collector’s guide which shows two nearly identical models with slight variations in the dial. Exact? You likely never will find one exactly like it.

I have a vintage Rolex with the same movement. The same, except mine has 18 jewels (not 17j, and it is a chronometer, adjusted to six position, temperature, etc. It looks nothing like the subject watch. So the subject watch would not be considered rare, because these are around that are 90% the same. Nice watch, anyway.

Neither of the three shown in the images are absolutely identical to yours. The three digit number inside the case back of your watch doesn’t appear to me to be a Rolex model #. It is not uncommon to find Rolex movements in cases that were not necessarily a Rolex product. Rolex agents in many countries used cases made by case makers of their own choice. Your case appears to be Swiss, and does have what appears to me to be genuine stampings. Ignore the prices shown in the one image. That image is from a price guide that is 17 years old.