I'm looking for some help. I have a square gold Mimo watch that belonged to my grandfather. I know a bit about the brand but am looking to know more. I'm also looking for any help as to how old this watch might be, its value and how I should maintain it (i.e should it be wound and how). On the face is written Mimo, followed by "21 Jewels" and "Automatic" and "Waterproof" at the bottom. Any help or information you can provide is appreciated. Thanks.