That's a good price. I picked mine up 3 years ago for the same money. a LGS in my AO has a used one for 600. Sold in 30 minutes. Great guns. Trigger is a little heavy but typical for 22LR. Great carry package for low vis with Federal Punch. I have about 1k rounds through mine.
For that price, I'd grab it. They aren't very common and are usually more expensive. If you want to "kick the tires", check the trigger pull, the little Smith .22s 43, 63 have had a rep for either having a nice trigger or heavy/rough trigger rarely in between.