1950s tin litho toy helicopters set of 9

1950s tin litho toy helicopters set of 9 probably made in Japan varying conditions would make great restoration project or spares or all 9 displayed 12 cm long 5 cm tall 2 cm wide 
Tin toys have a long history, dating back to the 1830s and 1850s, and were a popular choice for children's toys until the 1950s and 1960s: 
 
Origins
The Industrial Revolution made tin toys possible, and they were first produced in the United States in the early 1830s. Spring-activated tin toys originated in Germany in the 1850s. 
 
Production
Germany was a major producer of tin toys, with notable companies including Bing, Fleischman, Lehmann, Gunthermann, and Marklin. 
 
Popularity
The years from 1865 to 1895 are known as the "Golden Age of American Tin Toys". 
 
Name
Penny toys were a popular name for tin toys in the United Kingdom, where they were sold for one penny. 
 
Design
Tin toys were often miniatures, with painted surfaces that included excellent detail. 
 
Types
Tin toys included mechanical scenes, dolls, furniture, cars, trains, planes, boats, and animals. 
 
Decline
Tin toys lost popularity in the 1950s and 1960s as plastic became cheaper and safer. 
 
Collection
Tin toys are highly collectible and can be found in museums around the world