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Kellogg's toy submarine from the 60's. You put a tablet made of baking powder in the bottom and place it in water and i… | Vintage toys, Childhood toys, Best cereal
DIVING SUB Baking Soda Powder Submarine Dives/Surfaces Cereal Prize Toy | eBay
4M Mini Diving Submarines Toy (Multi-Colour) : Amazon.co.uk: Toys & Games
Cereal Box Baking Soda Submarine (video in comments) : r/nostalgia
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Baking Powder Submarine Custom Plastic Toy for Kid Promotion - China Promotional Gift and Promotion Gift price | Made-in-China.com
Cornflakes Soda Sub Boat & Diver Soda Cereal Toy (1986) - YouTube
Vintage 6 Baking Soda Diving Submarine Vending Machine Toy Prizes SKU 5 - Etsy UK
DIVING SUB Baking Soda Powder Submarine Dives/Surfaces Cereal Prize Toy | eBay