Companies are started, prosper or wither.
All over the world companies, thriving or withering, are sold and bought, or the remains picked up by competitors. Once proud WorPerfect made a mistake, and is now after having had some other owners part of Corel. The program is almost dead.
Nokia, once proud is now Microsoft. Car-companies are sold (once proud Opel almost died, Saab...) Supermarkets and departmentstores etc.
Penbrands are sold all over the world. Parker and Waterman have been sold and resold. Recently Cross changed hands, and Cross bought Sheaffer.
Don Yendl started a company and leased (or whatever other construction) the name Conway Stewart from the owners of the name, who were, I suppose glad they got some money from that.
The company started by Don Yendl did not make it, even after a restart. No chance (or microscopic chance) that company will be resurrected. So the name is once again just that, a name. It is likely the owners of the name will accept money from a person with a good chance to give them good money for that name. That person may not have any connection with the company started by Jarvis and Garner. But have a look around you, how many shops hold a name of a person long gone and owned by international shareholders? Is there any Parker or Waterman grandson in Newell Rubbermaid?
Such is business-life these days.
I was not into fountain pens when the Jarvis/Garner company was still intact.So I have no click with that company. I liked the "intermediate" Conway Stewart. They made good pens. Like any company they sometimes had a problem, but that was normally solved. But sometimes Toyota or some other brand has to recall some of their cars. Things happen. Nobody is perfect. If Manu has a good business-plan, knows how to make pens, and makes a good product for a good price, they will sell. If that pen is called Conway Stewart: Fine with me.
Good luck, Manu, you/your product will be judged on it's merits.