Casio is an affordable Japanese watch brand, which has superior quality as compared to the others in the same price range. 

Casio's vintage collection throws back to the original CASIO designs that defined technology and classic design. 
Making a 
CASIO watch a timeless staple.

They were among the pioneers of quartz crystal watches.
Their G-Shock series is extremely popular among sportsmen and military personnel because of its shock-resistance capability.