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My International School Bus Promotional Diecast Scale Model & Coin Savings Bank Bus Collection
International School Bus Promos
International School Bus Promotional Models
These appear to be promotional models commisioned by International.  Older models are a heavier diecast metal construction, all models feature free rolling wheels on rubber like tires.  Some types can be, or are exclusively made as coin savings banks.  
 

international model 1853 school bus die cast scale model international model 1853 school bus die cast scale model
 
international model 1853 school bus die cast scale model international model 1853 school bus die cast scale model
Bus Model:  International Model 1853 School Bus Coin Bank    
 

international model 3000 school bus die cast scale model international model 3000 school bus die cast scale model
 
international model 3000 school bus die cast scale model international model 3000 school bus die cast scale model
Bus Model:  International Model 3000 School Bus    
 

international corporation ic ce school bus die cast 1:53 scale model toy international corporation ic ce school bus die cast 1:53 scale model toy
Bus Model:  Internatioal Corporation IC CE School Bus    Scale:  1:53
 

international corporation ic be school bus die cast 1:53 scale model toy international corporation ic be school bus die cast 1:53 scale model toy
Bus Model:  Internatioal Corporation IC BE School Bus    Scale:  1:53