Dad has the "Flattop" a name which, he insists, may be considered a true American portmanteau. From the Eames era!
Anyway he's used one since I was in diapers ('early 70's). All his pen and ink art, '74 to current, all of his correspondence, this pen. Grandmother's was the gold-wash 75 above, my mom had the Sterling silver 40th? Edition? Probably got it for her 40th birthday, nevermind.
Whatever, a beautiful silver one. They take on a unique and splendid finish over decades of use: the pen becomes a custom-fit tool as the grid wears down in the high-friction patches of the writer's grip. Beautiful heirloom-quality pens, the Parker 75s.