pair of Mazda vintage ceramic porcelain Edison lamp socket or fuse holders

Pair of vintage old standard sockets for Edison base light bulbs or screw in fuses. These holders are white porcelain with steel mounting ears. They are marked H & H (presumably Hart & Hegeman who later became Arrow-Hart) inside a keystone. They measure 3 5/8" long over the tabs and are rated for 660 watts and 250 volts. These have some old smears of varnish (orange shellac, we think) in areas.

We're also including an old Fusetron 1 6/10 amp fuse with a mica window that was screwed into one of these sockets. It is marked as a Dual-element fuse and looks good.