RE: Omega pen refill
I checked mine, it is the same as the Parker T--Ball Jotter, although the one supplied is marked "UMO Extra Class Refill 8-0888" & is made in Germany.
When replacing, if you use a generic or Parker refill, make sure you don't lose the small spring that is Friction-fit on the refill that comes with the pen. Some refills may come with a spring because the Parker pen also uses one.
Hopefully this is helpful.
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