TWSBI 580 with my own self ground architect nib. I've taken the regular TWSBI silver coloured nib out and replaced with a Schmidt gold plated steel nib.
This is my own self ground nib. By no means professional so please take that into account. You can see by the writing sample below. Please ignore the 0.6mm designation below.
Nothing noticeable, bar a few microscratches
Piston. You will need bottled ink for this pen.
Currently inked with Diamine Earl Grey (the best!)
I will send safely packaged, no box. Second class signed for. Not sending with the box saves on shipping