Thanks Vin
Yes I am sceptical, it just all seems to cut and dry, the valve details given are just enough to convince you, but not enough if you get my drift. it's almost as if the valve has been taylor made for the book. (although I admit a collector, could have bought the book and valve together.
Unfortunately I have not had time to read the book fully only parts, so I would hate to comment at this point. (
To many commitments and other things to do)
as for the books value, well check the web, the only link you will get will give you the price. mind you thats for the 1933 first edition. I do believe there have been a couple of print runs on the book.