Early 1900s Porcelain Surface Mount Light

This little surface mount bulb holder can be used on either a ceiling or a wall.  The bottom part is unglazed and the screw on top is glazed with knurled detail. A charming period piece!

This doesn’t appear to have ever been used. Has some black marker on the bottom but otherwise completely unmarred.

Total height 1-3/4”
Base 1-3/4” diameter
Marked:  660W – 250V (That isn’t a typo – 660 watts)