This edition of Dr. Jekyll & Mr. Hyde was published in London (printed in Cambridge) in 1974 by Folio Press / J.M. Dent & Sons, Ltd.  It is highly prized for the illustrations by Mervyn Peake.   I could only find two copies of this edition.  None on Ebay but two on Abebooks.  Both were over $100.

Not knowing more, I've discounted that price by 25% assuming that would be a fair price.

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