Judging on the pictures that Yuki shows on his internet page there is no lume at all in the pearl.
You can add the lume afterwards but htat would make as expensive as a gen insert with a pearl.
This one , and it's a gen , cost me 85 euro's and is a hell of an improvement compared to a MBW if yo ask me.
By the wat the dial sucks big time of the "newest" MBW ( assuming this is a MBW as it was sold to me by a collector )
( the reluming with C1 and C3 was doen on my request , not quit what you would expect on a vintage dial )
Carpe Diem
Cats