Hi, my name is*****'m a certified appraiser, and I'd be happy to help.
I can't find records of the fifth edition. I do see that the fourth edition, circa 1929, is listed for sale at retail (through dealers) in prices ranging from $750 to $1500.
Who is the "printed for:" on the title page? J. and J. Knapton, or J. Walthoe, or some other company?
Sure thing, no hurry! If you could upload a photo of the page, that would be even better.
I did not. Where did you send them?
Photo upload instructions are here: