N7 1977 Accutron Quartz (Dual-Day) bought new in June 1980.
Hard to see, but the crystal is tiered, with the centre 1/3 flat, and the upper and lower thirds sloped.
My first "real" watch, got it for my Grade 9 graduation. Have treasured it, and worn it sparingly since. Still works like new, all original. Accuset button at 4 o'clock position.