Blue Seal [Twin Jack Pot] [Ball Gum Vender] [No. 2] © 1932 Watling Mfg. Co.
One Cent vender slot.
Selling price by years :
1932 - $55
1933 - $55
Machine's picture.
Collector's Treasury of Antique Slot Machines from Contemporary Advertising - Peter Bach - Page 78, 86 & 87
For Amusement Only - Thomas Gustwiller - Taylor Printing - 1995 - Page 33 (as Ball Gum Vendor)
Loose Change Blue Book for Slot Machines [4th Edition]