Ok, I'll come clean. I have been teasing you all a bit with this post, but I think you'll agree it's an interesting area. Now, I never said that I owned this plane - and I don't. It is currently for sale though. It's Patrick Leach's 'tool of the month' on his November listing.
Andy (Toolsntat) spotted that it was early and interesting.
Lwilliams is spot on about Nicholson and the fact that it's valuable.
Indeed, it comes from a time which is very important to Americans, and that's what accounts for its value. It's from the early colonial period. When the colonists started to settle in the 'New World' they naturally took with them tools from their old countries. For quite a long time, the Sheffield toolmakers enjoyed a good export trade, and for a while continued to export blades that were fitted into locally made bodies.
But with Nicholson, we get into the first wholly American made tools, and they take on an almost spiritual significance, as expressions of new independence. They were the tools that built the houses, schools and chapels of the new country.
So their value is far beyond what any of us would pay for a usable plane - which has also been accurately assessed in the postings here. Patrick Leach, as many will know, has for some long time been in the forefront of the second-hand tool market. His famous 'blood and gore' guide to Stanley planes is responsible for making rare tools desirable and valuable. So I am sure he knows what someone will pay for this very rare and special plane.
If you want to see how much he's asking for it, pop over to
http://www.supertool.com/forsale/Nov2010list.htm where you can read what he says about it and see some other pictures and other tools.