I picked up a nice Green J with a 9788 flexi nib. But it only wants to write if it's been dipped. The Green Estie writes fine with a 9460 in it though.
I soaked the 9788 nib overnight in soapy water, but it didn't help. Perhaps I need to soak it longer? Add a tad of Ammonia?
It looks in great shape and does write very smoothly, a bit stiffer than my 9048 (which is a favorite).