There is no book value for this, as far as I know, I do recall a sheet coming to auction in Perth West Aust about 2 years ago, my memory is hazy, but I may recall is was knocked down around $40. Take from that what you will. I would rescue (very gingerly) the sheet from the shrinking celophane you have it in, and use good husbandry and place it in a cool dry place flat somewhere. There looks like stains from being mounted with sticky tape some time before, this may alter it's current value somewhat.
Your best with these sorts of things is to Google using text strings similar to "1937 KGVI Coronation Cinderellas Full Sheet"
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