Well first an apology . I have informed you wrong the SE i thought was a 420 case is in fact a 100. So yes the 420 case has got 18mm lugs
Definitely a 420 case.
So the other request , as said all the dials are the same dia its the bezels that cause the confusion . I see you have a Seiko 009 so have used my 007 as an example . I used the same nato strap and tried to get the pics as real size as possable.
100 case