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vilms5000
@Scilly.Suffolk
Hey! Late to the "oh no it isn't party", but it may be useful for future reference.
Velobase can be a useful starting point, but all the content is user generated so not infallible. Amusingly the poster on VB mentions that CDA and Chorus/Athena are often confused, which is exactly what they've done (see comment at the bottom of the page).
CDA cranks are easily identified, because they're the cranks with self-extractors that aren't Record (four spider arms, fifth bolt behind crank).
CDA and (first gen.) Chorus are often confused because they are the same cranks: when CDA was binned, Chorus inherited the cranks. Second gen. Chorus has a raised lip (like a volcano) around the crank bolt, which I guess is what DFT mentioned above.
If it has five spider arms and is flat around the crank bolt then it's Athena or lower. I CBA to refresh my memory to confirm, but the difference between Athena and lower groups is purely the finish: cf. Xenon, which is painted rather than polished.