Not a lot of value apart from the gold melt value I'm afraid. The style is not popular and the movement is quartz.
Does it run? ( sorry, not likely without a crown, you could have a generic quartz movement fitted)
Try a new battery and keep it.
The model reference will be on the inside of case back when you change the battery.
I have a citizen that I bought in high school that is similar, very 80s.