Hello, I have recently acquired a pretty hefty Collection of First Edition Clock and Watch Books and Catalogs. Upon vigorous research online I have yet to find much help on appraising,considering most of them are very rare and from my knowledge not reprints. The Item in question is a Hardcover Bound "Chelsea Clocks 1906" "Illustrated Catalogue of Chelsea Clocks Co. clocks" there is no "No." that you typically find that corresponds to what copy number it is. Concluding my research this is the most helpful tip I could find.
"Prior to 1906 "Chelsea" Clock Company advertised their clocks in magazines such as “The Rudder" and "Country Life In America". During the early years of the company "Chelsea" spent the better part of their creative energy in designing and patenting numerous clock movements and cases. By 1906 these design efforts had been completed and "Chelsea" presented these ideas to the world in their first catalog, Catalog A of September 1, 1906. Over the next century "Chelsea" would add to this first catalog as new items were added or removed and prices were changed. "Chelsea" catalogs were noted by letter until 1928 when they were subsequently noted by number starting with catalog #14. Catalog A of 1906 contains 32 total pages. Two copies of this catalog are known to exist. One owned by the American Clock and Watch Museum, Bristol, CT. and the only known complete copy owned by the Chelsea Clock Museum"