It's not a high end watch, made with a generic Chinese movement and most likely made as a promotional gift. The back of your watch is askew. Maybe the battery was removed or replaced, but not done by a pro. I just notice those things.
So, somewhere between $30 and $40 based on those eBay prices. Maybe a little less because the tin box has some dings that might matter to someone. I'd split the difference and ask $35... maybe take $25 if it's offered. If it didn't say Plymouth, it's a $10 watch.
If you’re looking to get an idea of its value, a few things to consider would be the brand, model, and condition of the watch. Sometimes, checking recent sales of similar models on auction sites or collector forums can give you a ballpark figure. If it's a high-end or rare piece, it might be worth getting it appraised by a professional.