My friend has a 1927 Hardback original Manual. The book is blue and the letters are white. He is wanting to know how much is it worth.
Whatever somebody will pay. Watch eBay for one and see what it sells for. You want to see the actual sale price, not the fantasy amount the seller would like to get.
I've bought a couple from Abe Books for $15-20. I've seen them sell for $30-50 on ebay.
The book you are describing is the Ford Service book. The Ford Manual is more of an owners manual. I wouldn't be without the service book.