This is little beauty is from my personal childhood collection - the Hot Wheels 1970 Redline Seasider, in Spectraflame Yellow - including the original boat.

The Seasider was released in the 1970 Hot Wheels series, designed by Howard Rees. The undercarriage shows it was manufactured in 1969, but released in 1970.

It features a V8 motor with 4 twin carburetors in the front and a boat in the rear. The boat is a plastic two-tone white over orange. But sometimes this color-scheme is reversed. It was only manufactured in the USA with a black interior and clear glass. Production versions came with dual side exhaust pipes. 

Thanks for looking!