Thankyou for your detailed comment. The copy I have does include said spelling errors and all other points, but I agree with you completely that a book is worth exactly what someone else is willing to pay for it. This is largely the reason I came here, to see what people who are obviously interested in book, would think is a good price.

I think you should go back to the book dealer and sell it to him for $200 as you are very unlikely to get this price elsewhere.

The book is quite common, I bought a copy in pretty good condition recently for $30, which was cheap as the book would normally sell for $50-$100.

On a very good day your book might sell for up to 100 USD, but due to the high numbers printed this edition generally sells for 30-50 bucks.

The presentation copy issued by Methuen in Canada in 1977 may sell for $600 USD, perhaps you are confusing it with this.

Sorry that it is not better news.