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I don’t think that’s a mad deal without knowing the tubing.
Whilst maybe not a 'mad' deal, I think it's a good, if not very good price.
I can't state what tubing it has been constructed from, because I don't know, but it's a Rossin, so they won't have nipped to B&Q and bought some gas-pipe.
As you recognise, given the construction includes internal cable routing and a chromed fork crown, in all likelihood it will be SL or SLX, but as I don't know with any degree of certainty (and in my opinion it makes very little difference) I'm not going to make a claim I can't substantiate.
All of which means:
This is a quality frame, offered at a reasonable price. Someone should buy it, build it up and live a better life because of it.
I don’t think that’s a mad deal without knowing the tubing. If it’s lower end that would be pricey.
Edit: sorry to be fair looks immaculate tho and I guess chrome fork and internal routing would suggest higher end.