20" or 23" Cinema Display contrast ratio and models

I am searching for a used Cinema Display, either 20 or 23". I want to ensure that I am getting a recent model, and I have seen mention of older 400:1 units, and newer generation 700:1 units.
How can I tell what I'm looking at when I am searching? Are there specific model numbers I need to look for, or was a change made midstream? Thank you.

Purchase a display originally sold after August 7, 2006. This was a midstream change.
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