Can anyone tell me how much these armchairs and couch are worth and if they're authentic vintage or not?

Here are photos of the furniture

We purchased them from a man on Gumtree and he said he thought that they were from around the 60s/70s.

We looked into it and apparently they're "Danish Teak" and all examples we found were very highly priced and were wondering if that's what we have on our hands as well.