How to spot the fake Omega Seamaster 300

The following are some of the photos from the internet on replica SM300. One way to tell is the protruding bezel. Look at the dial, hands, back case (Flat A) and the movements. 

https://forum.replica-watch.info/forum/vintage-watches/7748510-omega-seamaster-300

Dial not original

http://scubawatch.org/hallofshame.html

In addition, beware of the newly assembled Omega 300SM using genuine parts;

https://ialreadyhaveawatch.com/2009/11/14/watchco-omega-seamaster-300s-legitmate/