I love streamlined tools, very kewl :)
no clue on date, wild guess from style 50's-60'??
>The vendor number is 149
Which is AMCo/AM&T/ American Machine & Tool Co, Royersford, PA
But that doesn't help dating it much, anywhere between 1928-2002
The packard electric motor doesn't help either, 1902-LastWeek
(In case you were wondering, it was the same Packard that made cars, the company split off an electric motor company in 1902..)