OS CZ MX Marine RC Engine with Recoil Starting System, Model 73001 (box also says 11270). Manufactured in Japan, dated 1991. Includes instructions, details and is complete. Box shows some edge wear. This engine is no longer manufactured but replacement parts are available on the internet.
The O.S. MAX-CZ-MX is a high performance water-cooled marine engine designed for small radio-controlled boats, especially scale and sport type hulls. It incorporates a recoil starter system which eliminates the need for a starter battery and electric starter. Fuel - use only top quality commercial model two-stroke engine fuel. This engine is designed to run on both low and high nitromethane content fuel