The monogram and coronet are those of Henrietta Frances, Countess de Grey (1784-1848), fifth daughter of William, 1st Earl of Enniskillen. In 1805 she married Thomas Philip, 2nd Earl de Grey of Wrest Park, who served as Lord Lieutenant of Bedfordshire, First Lord of the Admiralty from 1834-35 and Yeomanry Aide-de-camp to William IV from 1831 to 1837 and to Queen Victoria from 1837-59. Lady de Gray was described by Harriet, Countess Granville as "Very affectionate, [she] cultivates with care and waters with every sorrow that blows... The men treat her with the sort of homage one hears was shown to Lady Coventry in former times. The admiration she excites is quite curious" (Complete Peerage).
"Hock" was an generic term for white wines from the Rhine region, adapted from the German "Hocheimer", much as "claret" referred to wines from the Bordeaux region. Rhenish wines, characterized by their deep amber color, were particularly popular in nineteenth century Britain, and their reputation was further enhanced by a visit by Queen Victoria to the wine making region in 1850. Hock was traditionally served in green glass vessels.