You might find this helpful, I think it starts in '85 (don't quote me on that though, it definitely finishes '97): Dura Ace timeline - Road Bike, Cycling Forums
Of course if you're happy to mix and match various shades of 7400 based on preference that will be easier and probably cheaper, but if you have a frame and want matching period correct bits this should help.
@Fox started
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You might find this helpful, I think it starts in '85 (don't quote me on that though, it definitely finishes '97):
Dura Ace timeline - Road Bike, Cycling Forums
Of course if you're happy to mix and match various shades of 7400 based on preference that will be easier and probably cheaper, but if you have a frame and want matching period correct bits this should help.