1967 Sandoz Chronograph. I like the blue dial and impossible to read internal silver tachymeter, 35.8 x 40mm. screw-back case, manual wind mov. Valjoux 7733.

A tachymeter scale measures how fast an object is moving. The scale can be found either on the dial or in the bezel. Most tachymeters start at 400 and end at 60, but some models can show different numbers.

Sandoz is a Swiss watch brand, originally established in the late 19th century by Henri Sandoz near Tavannes, Switzerland. There are now many variations of the Sandoz name which are used by at least four different companies around the world.
Since 1971 the Sandoz brand name has been split into four main areas of production, due to its licences being leased or sold. This has led to four separate brands, Sandoz Singapore, Sandoz Hong Kong, Sandoz Swiss, and Sandoz Spain (Munreco). All of these produce watches under the Sandoz name, but each production company has its own line of products.