the first one is a ref 2852.... I hope... the next one is either a 2699 or 2700 depending on the case back... one being snap in and the other screw in? I am till working on the other two.... am I even close?
Let see how far my skills have deteriorated. There are guesses amongst these answers...... #1: 2852 #2: 2699 (EDIT for @Lessismore: you can tell by the inked OMEGA instead of an applied metal OMEGA - which is the difference between a 2699 and 2700) #3: Those fatter lugs should ring a bell, but there's simply too much wine in me right now. #4: 2517. These came with plank dials too I think.
You mean #4 isn't a 2517? F me! I even looked up Mark / SpringDriven's and Evan / gatorcpa's versions!
Gotta be. Almost a given. EDIT: here's the proof: http://omega.watchprosite.com/show-forumpost/fi-677/pi-3873966/ti-617906/t-omega-by-omega-you-mean-/