Penelope may indeed recognize Odysseus before his revelation due to various interactions and cues throughout the text.
Penelope recognizes her husband Odysseus by the end of Book 19 before he reveals himself. This is evident when she interacts with Odysseus in disguise; the verbal sparring and her response to certain comments hint at her recognition. Additionally, scenes such as Eurycleia recognizing him by an old scar contribute to the notion that Penelope might have realized his identity.
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