Identification Help: Tidemaster Automatic Swiss Made Watch

Hi,

I am bidding for this watch (15$ currently), and I just wanted to find out if anyone here knew more about it. I have never heard of Tidemaster in this context. The dial says Swiss made, but I am unsure what brand it would be. Unfortunately, the seller does not have photos of the movement/ inside case back. I hope to pick it up regardless of value because I think it looks neat, but any help discovering more about this watch would be appreciated. Thank you!

After some research, I was able to discover a little bit about this watch. It appears to be a 1960’s swiss-made Skin-Diver that is missing its rotating bezel. It is now in my possession. The case is very sharp and the watch runs, but the date function does not work currently. The movement has a very satisfying sound so I am excited to open it up and take a look. Here are some more pics of the watch. I will try to update with pics of the movement soon.