Purchased this 2852 (505) late last year and it just came back from having the movement cleaned. Amazing accuracy.
I've collected a few Seamasters (favourite one is from 1956). This is my first Constellation and has now bumped the Seamster to second place. Really impressed with the looks and not least the accuracy. Looks like it's keeping pace with my PO (8900) which is no small feat.
Just added one on left to my small Connie collection. Still looking for correct box for the Megasonic....
Thanks to @JohnSteed I now have this reference 14381 with the elusive rail track dial. Note that the Omega symbol and star are silver and the rest of the dial furniture is gold