That's the Professional model. You can tell by the super long points on the BB.

Here's a picture of one being brazed up: http://tinyurl.com/kmu9o4

edit: $100? Man.....a new one is $1000 MINIMUM. Start adding options, and that escalates quickly. Of course this is the same with a lot of old bikes, but it gets my attention simply because Mercian just charged my card $1600 for a decked-out custom King of Mercia!