My favorite fountain pen, the Namiki Falcon, modified by John Mottishaw at www.nibs.com . You can find the regular version here: https://amzn.to/3mWxbmW

The ink is Iroshizuku Tsuki-yo Night Sky (Greenish Deep Blue) which shades wonderfully on Bristol Board. You can find it here: https://amzn.to/36cmgyV

I had this nib specially modified by John Mottishaw. He ground the nib extra fine and added flex to it (the Spencerian customization).