I'm carrying these two pens this week. The one on the left is a Parker Lady Duofold from approximately 1928. The one on the right is a Parker Jack Knife Safety Model 98, from the late-teens to very early-20s. Both were designed to be a lady's size, given the ringtops on both. The Duofold is loaded with Waterman purple, while the JKS 98 is loaded with Waterman brown.