Joined: Jan 2010
Posts: 9,797
Likes: 1,762
From: Northern California
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
Great find, the 210 of that year should have Canti brakes and relaxed 72-degree frame angles, at least for the middle-sized frames. So it's a true tourer, moreso than the six-ten.
Don't bother "fixing" a rusty chain, they break and this is dangerous. A decent new modern chain is cheap and is better than any chain that this bike came with.
You might want to just "oil can tune-up" the bearings so as to be able to do evaluation riding, making sure no bearings are running tight.
What color is your 210? I found a couple of gold ones from that era about 15 years ago at the thrift store.