Inspired by the excellent thread "Dating Montblanc 149s", I've thought we could try to embark upon a similar task with another iconic pen, the Sterling silver cross-hatch Parker 75. So please take a look at the chart below, which I have partly based on information from the Parker75 website and partly on advertisements and my own observation of a good many number of exemplars. The idea is that this be an ongoing exercise to which some of you could eventually contribute. For the time being I've limited this to the sterling silver cross-hatch pens made in the USA in the 1963-1975 period, which are the core of my own collection. ... and please don't be too harsh on me!!!