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This page has currently the year span 1620-1650 in its name. That's really not saying anything.
In contrast, Prado website lists this as 1620-1623. Note how the accompanying text has not been updated after the Masterpieces discovery, but the year has.
However, if the end date has any likelyhood at all of being contested or in danger of changing, why include it at all in the article name?
I suggest we rename/move the article to either of the following suggestions (in order of preference). These links are deliberately red (for the moment):