I stumbled across this great photo. It has some legendary names connected to it, even the track name..
First we have: Frank Williams, Alan Jones, Patrick Head and Carlos Reuteman.
The team.. TAG Williams
The track.. Jarama !!
The timing equipment.. Heuer & Longines

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If you are wondering what a 'Centograph' is...

The "Le Mans" Heuer Centigraph was developed in the 70's in co-operation with the Ferrari racing team, was an electronic timing device composed of a mechanical printer and keyboards equipped with 5 manual push buttons. With the Centigraph, 20 cars can be timed simultaneously. This type of installation was used for timing F1 and endurance races (Monza 1000 km, Vallelunga 6 hours, Sebring 12 hours or the Le Mans 24 Hours races).

Cheers
Stewart