I would be much quicker if I wasn't 5000 miles from home
Letters of Administration of the personal estate of Robert Glass late of Belfast Merchant who died 14 March 1887 at same place were granted at Belfast to James Glass of Bedford-street Belfast Merchant the Curator of the Minor and Infant Children (Limited.)Letters of Administration of the personal estate of Robert Glass late of Ulsterville-avenue Belfast Merchant who died 14 March 1887 at same place (left unadministered by James Glass Curator of Minor Children) were granted at Belfast to Robert Glass of 14 Posnett-street Belfast Merchants' Assistant the Son. (Former Grant 16 September 1887.]Seems as though there was also a son Robert and estate wasn't sorted out until date of grant (19 July 1895- possibly due to children being minors when he died?)
1880 directory-
http://www.lennonwylie.co.uk/alphanames1880gh.htmGlass, James, & Co., linen handkerchief, cambric manufacturers, 5 Bedford St.
Glass, J., (of J. Glass & Co.), 5 College Park East
Glass, J. D., linen merchant, 5 College Park East
Glass, Robert, & Co., linen merchants and manufacturers, 22 Bedford Street
Glass, Robt., (of R. Glass & Co.), 29 Ulsterville Avenue
1901-
http://www.lennonwylie.co.uk/alphanames1901FG.htmGlass, Robert, & Co., linen merchants, 33 Donegall Place
1907-
http://www.lennonwylie.co.uk/alphanames1907FG.htmGlass, Hy., draughtsman, 44 Cromwell Road
1918-
http://www.lennonwylie.co.uk/alphanames1918FG.htmGlass, J. B., tea agent, 81a Victoria Street
Much more in the directories