Onix chronograph

Stainless steel Valjoux 7733 chronograph. Telemeter (red) and tachymeter base 1000 (blue) scales. No lume on dial. Back labelled “Waterproof” (the term was replaced with “waterresistant” in the early 1970’s). Slight patination on inside bezel. Hairline on dial between 10 and 11. A version of a chronograph some would call a “poor man’s Heuer Carrera”. 39 mm.