Donnelly Antiques Ltd has dated this piece to the Georgian era.
Author anonymous [Thomas Mortimer], published by Charles Dilly, London 1791.

Handsomely bound in striking tree calf with gilt decorated spines. Frontispiece to Volume I. Internally age toning and the odd mark/spot here and there, otherwise pages are generally clean with wear and marks to the covers consistent with age. Hinges to Volume 8 cracked but holding well.
Each volume has a height of some 17.8 cms, a depth of some 11 cms and the total width of the set is some 18.7 cms.
Donnelly Antiques Ltd has dated this piece to the Georgian era.
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