Hi Chris. Great entrance!
Yes, your 30L is inside a reference 8888, and I can say so definitively because I have the identical watch.
The Conquest 19AS is in stunning condition - how's the fish medallion's enamel? That should be a case reference 900x. It's probably a replacement crown, but the originals do pop up once in a while so it's not a big deal.
One of our members just snagged a Flagship Ultra-Chron very similar to yours, except your's looks in better shape. What logo is on the back, if any? That'll help determine the case reference if you don't already know it.
You've chosen 3 great examples of Longines from a great period for watches.
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