I've been thinking about this for a while, and I'm trying to understand what exactly we mean and why we care?
Clearly whatever is being currently sold by Omega is "modern".
What do you call something that is discontinued but still receiving factory support in terms of parts and accessories?
What do you call something that no longer has factory-supplied spare parts?
What do you call those watches that Omega will restore for $1500 and up and they will make the parts if they don't have them?
For the purposes of Omega Forums, how about just being explicit by date? 2000--current, 1980-1999, etc, we can discuss those numbers, but there is no guessing.