slinky
 
Slinky
The first slinkies were sold at Gimbels Department store in Philadelphia in 1945, and they have been a staple of toy departments every since. Watching a slinky "walking" down the stairs is a rite of passage for most American children. (Untangling slinkies is a rite of passage for most American parents!)
Bonus: they make a wonderful sound when shifted from hand to hand.
dimensions: 2¼ inches high by 2⅞ inches wide

$6.00
Also available:

To order phone 617.864.8188 or email (info@joiedevivre.net)
Joie de Vivre, Cambridge, Massachusetts.