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Old 07-18-21, 12:26 AM
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Dfrost 
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The “Q” stamping indicate those that are part of the original cassette. The finish that looks common to all of them suggests that they are the original set. You’ll find that one in the table within this article from the Sheldon Brown compendium. It sounds like you’d already discovered that resource. Remember that DA 7400 stuff had some unique characteristics.

https://www.sheldonbrown.com/k8.shtml

Generally the spacing is pretty uniform, but as you’ve discovered, it can vary, especially with the outermost cogs. If the shifts are good, then you’re golden!
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