Pilot Falcon flexible nib fountain pen in gloss black lacquer over steel, with rhodium-plated 14K gold nib with gold-plated trim.
Note that while this nib is ‘flexible’ by modern fountain pen standards, it’s not as flexible as many dip pens and vintage flex pens – it’s soft, and spreads with pressure for a wider line, but vintage flex fans looking for a ‘wet noodle’ would be better with a dip nib!