This is going to be wholly unhelpful, but you did say "money is no issue"...
Montblanc Rita Hayworth.
This is probably one of the most aesthetically pleasing pen for me. Definitely one that I think I will forever be able to picture in my head and one that is the ultimate Grail Pen for me.
On a more useful note...
I would do a custom Nakaya Decapod Twist Kuro-Tamenuri with Maki-e Cherry Blossom Silver Powder.
I'm somewhat afraid to ask them how much it would cost!!!
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