Rolex 5100: Beta 21

[Blackyb]

Hello everyone,

This is my first post and I hope that I am posting in the correct thread. If not please let me know and I will repost in the correct one.

I have recently come across a Rolex Quartz, model 5100, NO. 252 in 18k yellow gold. It is in great shape with some dents and wear but it is minor. It also has the origanal box and service papers from servicing in 1982.

I am just wondering how to figure out it's value and also if I decide to part ways with it the best avenue to go about selling it. I have just checked out Chrono24 and I'm aware their pricing is a bit out to lunch but there are several available foe $25K to $140K!!! Is this correct?

I have attached pictures and appreciate any advice.

Thanks,