That's sort of a loaded question; pardon the pun.
I'm not a great No. 3 fan, preferring the No.1 which, for only a little more money (or the same, in some cases) offers a lot more style, ergonomic sense and retained value (again my opinion).
That said, in a weak moment, I did buy a No. 3 in 223 a couple of years ago that had a Leupold 2-7 scope on it. My records indicate that I paid $675 for it. I sold the stock set and added some aftermarket wood that improved the looks and handling about 200%. I also recently bought a No. 3 Liberty gun (1976) in 22 Hornet, but I bought it for the caliber and for the fact that it had a set of No. 1B wood on it to include a non-prefix buttstock (oh, and a 3-9 Leupold scope
)! Again, I had a nice set of custom wood for it, and now it is a dandy, beautiful walking around varmint rifle.
Depending on what the scope is worth on the one you saw, and how much you want a No. 3 in 223, it might be a "good buy" for you, especially if you can talk them down a little on the price.