They are Heuer.
I have one that is new in the box (NOS) with the papers/instructions and the box. The box is made of clear plastic with blue ends which are marked "EASY-RIDER CHRONOGRAPH A PRODUCT OF HEUER". The second page of the instructions state "Your chronograph "EASY RIDER" is a product of HEUER-LEONIDAS SA Bienne, Switzerland's largest manufacture of stopwatches and chronographs". It also has the original black leather perforated strap with the Heuer logo buckle. I also have one of the cheaper "EASY-RIDER" that is signed by LEONIDAS in the same box with same instruction. It has the black rubber strap with large holes and no Heuer logo buckle.
: Good point. Guess I meant that they just aren't
: labeled on the dial as Heuer.