Speedmaster Seamaster Railmaster Whats the origin?

Posts
69
Likes
80
Can somebody explain the name series for me, i feel im not really understand.
Ok i see that many speedmasters got additional markings and sometimes extra subsecunds dial. so i guess its often a time keeping watch 1/10 sec 1/100 sec, but not all or?
Seamasters is often water resistant, some is divers, but many of them is just like 3 ATM that not much;-) But maybe in the 50s?
But Railmasters what....?
 
Posts
69
Likes
80
Railmaster = Antimagnetic.
Yes i got that now. To be honest that is not a really clear connection for me seamaster =water. Speedmaster= velocity of any kind. Railmaster=...trains