Movado Women's Watch - Purchased in 1958

Back in 1958, my father working in Kuwait, along with the Prince of Kuwait, went to purchase (2) 18k gold watches, one for the Princes' wife and the other one for my mother, both the same model (S167506-R3504). The watch (a wristwatch) has an automatic movement, 750 (18k) solid gold / 22 jewels. My mother passing away, beside the sentimental value, I would like to know if there is someone who can provide me with an estimate on it's value and if it's a collector's item. Thanks.