Today it is a Danitrio, a Takumi sized (about Montblanc 149 size) Megatame Raden fountain pen with a medium Dantitrio (Bock sourced) Fireball nib. It was created by a master Zhi Hao and was prototype for the Formosa Series of pens.
With the Nakayas all flushed and put away it is the Danis and Platinums that get to play. Today it is a Platinum Izumo in Akatamenuri (much darker than the Nakaya Akatamenuri) filled with some old Omas black ink.