[Arran]

I wouldn't pay that even if I did like it, I've seen those on fleabay for a fraction of that much, even nice originals. Most of the time they don't sell or if they do with few if any bids. I also don't trust most of the Radio Attic sellers, many are good at writing ad copy bragging about how great their stuff is but if you buy you often end up paying a premium price for an as is radio with just enough repairs to get it playing, not a restored set. If it was restored thoroughly he should post pictures of the underside of the chassis and be able to produce a list of what parts were replaced. Electrically restoring an early to mid 50s radio is a breeze compared to a late 1920s Atwater Kent, they aren't doing you enough of a favor to warrant paying an extra $150 for one of these.
Here is something similar in style, but not the same model:

http://www.ebay.com/itm/1957-Philco-E-97...20cebda6c0

Regards
Arran