Tin toy manufacturer Masudaya (founded in 1923, Tokyo) was a Japanese leading producer of battery and mechanical operated toys in the post- war period, and unlike most of their competitors, has managed to survive to this day. Masudaya normally identifies their toys using the M-T, or Modern Toys logo.
Masudaya was known for essentially creating the 'skirmishable' airsoft gun. They were the first to design airsoft guns to be used for combat simulation. Before that, all airsoft guns were essentially for target shooting in your backyard.
Masudaya has produced hundreds of toys through the years, many of them vintage tin type toys either wind-up or battery-operated, in addition to the following Airsoft replicas:
What's it worth? Take a look at this Masudaya price guide: sold listings for a value indication.