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I'm trying to track down and license a font called Chelmsford. It's influenced by/derived/ripped-off from Optima, but comes in a very light weight and has a few added touches -- an Optima Titling Light, if you will. Check out the A, for example.
My guess is that this dates back to the early days of DTP, and is a digitization of someone's film/CRT version of Optima. MyFonts, Fontshop and Fonts.com (along with a general Google search) didn't turn up anything.