I cannot find any information on this model, but looking at the pictures and the ad I would say the following:
It looks like a well designed model and it is a good size, so it should sail well.
Definitely a model for the experienced modeller. Maybe why it was started but not finished.
My main concern would be, is it complete?
You may want to ask specific questions about the masts, there is mention of timber, but no mention of masts specifically. I would also ask about the keel bulb, rigging, and any fittings for the rigging.Even if bits are missing they can be sorted out, but you would need to add this expense to your costs.
At the current price it is a bargain, I think the price could easily go over 150. It just depends who is interested and if there is a bidding war.