Take a good close look at the wood, and I'd want to see the metal under it.
What's that chip in the wood behind the top tang?
The forend looks like a replacement.
Is the wrist sound and solid under that checkering..?
The action metal looks a little 'buffed' to me - and note that the forend iron has been refinished too.
As a matter of course I'd also be looking very very closely at the lumps and hook to see if there's been buggery there along the way.
Can you get real-for-real barrel thickness measurements?

Just make sure your 'peek under the skirt' is complete and that whatever you find under there is a good dovetail with your budget and how you plan to use the gun.
I somehow suspect this one is in 'good as refinished, user grade' condition.
It's very hard to tell much from the photos.

Straight-stock rifles can handle quite nicely, I've had (and still do) straight-stocked bore-rifles and I really like how they've handled and shot.

Cheers
Tinker