Advice needed about a second hand purchase

So i found an ad on Facebook marketplace for Hamilton khaki x-wind 

I have some money saved up for the new Seiko Laurel that is being launched. But I found this opportunity to buy this watch for cash for a 50% discount. It has light scratches, a local watch smith is selling it because his friend sold it to him because he was running out of money. Since it's without papers etc. Only with the box, I really like chronographs and I mean is it not a bargain ? Original price in my country 48-52k CZK for new he is selling for 20k czk cash. 

Thoughts ? 

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