1955? 2402-7 344 bumper small second dial

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Appreciate any wisdom. (first watch from the 50s!) Think it’s a 1955? 344 movement, 2402-7. Have seen a few 2402-6 but haven’t found a -7. Can’t find much info on it and haven’t ran across many examples. Thank you for sharing your thoughts on it to help me better understand this old watch!