I disagree that the best bottle was the Sheaffer Skrip with the internal inkwell, because it wasn't particularly stable, and the opening was just too wide. Also, the latest versions of Skrip bottles that I have, are fitted with thin gold metal caps with smooth edges that aren't so much screw fit as click fit like current preserve jars. I've never found one impossible to open, but they can sometimes be really tight. They certainly don't have any ribs and they have a tendency to leak
Even the older versions of Skrip bottles had ill fitting, screw on, metal caps that were prone to leaking and rusting.
I have a very good friend who was kind enough to send me an old bottle of Sheaffer Skrip ink, together with another bottle of ink. She had the foresight to pour out the Sheaffer ink into a plastic bottle with a tightly fitting cap, so that the bottle couldn't leak while in the mail.