Vintage Caterpillar Slinky Pull Along Toy

Vintage slinky 'Cater-Puller' pull along toy in green and yellow. Awesome vintage toy - I believe it's 70s era but not 100% sure. Shows some wear, mostly scuffs here and there, is missing one wheel, still works great - see photos for condition details. Measures approx. 12" long when closed, 5" tall including antenna.