Hi Randy,
In order to meet your specs for a large pen with a generous ink supply, I would firstly recommend the Great Exhibition pen. It measures eight inches when closed, utilizes the eye dropper filling system and has an ink capacity equivalent to 8 x ink cartridges!

Keeping within your requirements, the next largest pen Conway Stewart produces is the Churchill model in lever fill. There have been quite a few people here on this forum who have complained (and rightly so) concerning the ink sac and jbar, but this was a problem inherited during the take over and this is not an issue anymore. Another minor headache that has been associated with a few pens was the ink flow, however Conway Stewart is using a new feed design and have not experienced problems since.
The Churchill is available in a wide choice of finishes and here are just a few to wet your appetite.



There are many people here who have a great amount of knowledge concerning vintage/classic pens and hopefully they will read this message and be able to respond to you.
Kind regards,
Mary Burke