Product Name Skrip Converter. PenHero has an article on early Sheaffer converters. This is the converter needed for the Lifetime Cartridge pen and some Lady Sheaffer Skripserts.
Manufacturer and Year Sheaffer USA -- 1960s.
Filling System This works like a piston converter. You grip the end and pull it out and push it in. The directions on the converter say to "pump 5 times."
Condition New Old Stock in mint condition. It has not been used and has no staining. The imprints aren't overly worn.
Here are the known Sheaffer converters. Top to bottom: modern piston converter, standard size squeeze converter, button converter, gold converter from the Legacy touchdown pens, slim squeeze converter, accordion Skrip converter.