Blue Seal [Jack Pot Front Vender] [Style 42] © 1930 Watling Mfg. Co.
Nickel Play.
Blue Seal [Jack Pot Front Vender] [Style 42] was sold $80 at it's release. The new price was $70 in 1931.
Also released as a Quarter Play model called "Blue Seal [Jack Pot Front Vender] [Style 52]".
Collector's Treasury of Antique Slot Machines from Contemporary Advertising - Peter Bach - Page 47 & 62
Loose Change Blue Book for Slot Machines [4th Edition]