Sifu Yen amazing info and comparison there where most of it I dun understand but only one point I would like to comment is not all PAM model is COSC tested n certified my 210 is not certified by COSC.... 
yes!
for historical line
all marina/those with small second model with cosc
all base/without small second model no cosc
unless u buy a cosc grade or non cosc grade movement from eta.... but not for pam.... pam use same grade
so only different cost is to get the cosc different is another thousand.... thats the only different!
pam may even need to pay more to remove the small second.... lol