Pelady, the reasons/observations why I say telephone bench is because:
The phone would fit nicely inside the pop up area. (Sewing items would have to be crammed in and slammed on.)
The drawer would hold pencil/pen/note pad
The HIGH SIDE of the bench would make it troublesome to sew - elbows would hit constantly - yet you could sit
easily straight forward or at an angle and converse.
As for the casters, general purpose was to make it easier to clean. Also, wheels became a style. You see light
weight chairs with casters on them and know that they are just as easy to move without them.
http://www.antiquetrader.com/antiques/furniture_detective_antique_castorsIf you search "upholstered telephone bench" or "Gossip Bench" you will see that they generally have tall sides and backs to the seating and come with all kinds of configurations of shelving, drawers, stowing. It does carry some of the characteristics of an old "Bustle Bench" but they didn't have the storage areas
The search is on....