The Heuer Chess Champion was originally made for Heuer by another Swiss company, Looping.  Looping made a full range of travel and desk clocks, and from 1968 through 1975 Heuer was the exclusive United States importer, distributor and service center for the company.  Looping went out of business in 1980, and Heuer began sourcing its chess clocks from a German company, Jerger.

For an interesting account of chess clocks, see the Hodinkee posting — Culture Of Time: Chess Clocks, Time, And ‘The Queen’s Gambit’.  For an interesting history of Heuer’s chess clocks, see this posting from the Chess Museum website.