Welcome! Watches have reference numbers to help identify them. They are typically located on the inside of the case back. In your case, the reference number is 166.0202.
With that information you can look up other details about the watch, including pictures of other examples. The movement inside is a caliber 1010. There is a serial number on the movement that is not visible in your pictures but can help you get a rough date for the watch using online tables.
Your watch needs to be serviced by a watchmaker. That’s where they disassemble the watch, clean and inspect all parts, reassemble, lubricate, and adjust the timing. It appears your watch is missing some parts, including the crown and winding stem. There also appears to be one case screw missing and you could use a new crystal as well — all things a competent watchmaker could fix, if you decide it’s worth the cost.
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