One time, years ago a lawyer friend/car collector told me that anything that isn't in current production... "is worth whatever you can get for it". Current limited production kits of similar old style pattern planes go for around $150 (wood) or so on up to $275 (glass/foam or ARF) or so. Some out of production kits sell for $300+ on eBay. I recently bought a nice o.o.p. pattern kit for $100.

Terry in LP