First post, advice needed 16013

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Dear members,

This is my first post. I received an old 16013 from a family member. He says the watch is approximately 20-30 years old. He told me I could wear it or sell it, whatever I prefer.

The problem is this:

1. The watch has not been serviced in these years.
2. It looks pretty beat up (I will post pictures if needed)
3. The plexiglass has scratches and even a few tears.
4. No papers, box etcetera.
5. No extra links, it fits a 7" wrist.

What should I do?
1. Keep it and get it fully serviced (would set me back around 1000 euros right?)
2. Sell it, for who knows how much..
3. I plan on buying an Omega planet ocean chrono 9300. Maybe trade it in?

Any advice will be much appreciated!

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