Well, that one's interesting. I'd peg it for the 1950s, when there were lots of tools made for small drill motors. The increases in universal motor efficiency spurred by the war, and the availability of aluminum production facilities (also spurred by the war), made small drill motors affordable; and the influx of new homeowners, anxious to start their adult lives after the war, created a sizable market, but not necessarily one with enough money for big machines.
You might try, too, over at Old Woodworking Machines:
http://www.owwm.org/index.php. The distinctive color might help...but I'm not terribly good with that kind of ID.