I agree on the size issue. For reference, I'm 6'0", and I typically ride around a 58cm. I can ride a 62cm.
Also, a 610 isn't especially rare, nor should it be that hard to find the style of vintage tourer you're seeking locally. Given a bit of patience, I think you can find something in driving distance. And the one you linked may have "free" shipping, but it's just been built into the asking price.
Since this is to be a bike you'll ride all day several days in a row, fit is really important. I'd encourage you to take the money saved by not having something shipped and put it toward a bike fitting. There are tools online and phone apps, but a pro who can help you and understands the kind of riding you're planning to do could help a lot.