I don't know much about Gazelles. It's not a top-of-the-line frame, but Reynolds 531 (see the decal on the upper part of the seat tube?) is a good sign. It may not have 531 fork blades and stays, but that's not the end of the world. If it does, the decal will say so, otherwise, it will just say "frame tubes".
The Shimano 600 components are a very good (again, not the highest end) and good-looking too.
As for the price, you might do better if you had a lot of patience, or you might not. The bike looks like it's in excellent shape, and hasn't had a lot of use/abuse. Funny that there are only two brake cable braze-on loops on the top tube; check if one has fallen off.