[Arran]

It looks like a basic B&W set, which means it's probably not too complicated inside, if the picture tube is good there is hope. I'm not so sure that attic storage would be worse then a damp basement, those things ran pretty hot inside when they were in regular service, so dried out electrolytics would be the main issue. Lets see, 1963, that was the post Predicta and FoMoCo takeover era, so they did tighten up the quality somewhat. If you want to keep it running on mostly original parts, well yes, it will need attention every few months, but if you recap (paper and electrolytics), and re-resistor the set like a 1930s radio that will eliminate most of the likely problems. The only other snag is the K-networks which would have to be reconstructed to get the most out of it , but it would likely still work without replacing those. Realistically the original poster was probably not thinking about turning this into a daily driver, something you would need a converter box to do now anyhow as the analog signals are mostly gone, and it's a B7W set, but probably more about getting it going just to show to friends.
  Brand Z TVs are a funny animal, the sets of the late 1950s through the 1970s are actually of better quality then the earlier sets. It seems that once they put Commander MacDonald out to pasture they cleaned up in the engineering department, dumping the weird designs, and stopped letting the bean counters design the sets. I've seen Chromacolor II sets from the mid 1970s that still work and have never darkened the door of a service shop, there was a reason why they were the last American company to make TVs in the U.S.
Regards
Arran