  We present a picture of the very unusual blue straggler S1082 in the old open
cluster M67 whose light is the sum of a close binary (P = 1.0677978 d) and
another cluster member. We provide a complete V-band light curve for the
system, and show a number of unusual features including brightness variations
at the 0.01-0.03 mag level from month to month at all phases, and a narrow
primary and broad secondary eclipses. We use spectra from several sources to
constrain the temperatures of the three known components, the relative flux
contributions, rotational velocities, and radial velocities. The data clearly
show that the brightest star (narrow-line component) seen in the spectrum is on
an orbit with period P = 1189 +/- 7 d and eccentricity e = 0.57 +/- 0.08,
although we cannot prove that there is a dynamical link between it and the
close binary. Our models of the system indicate that the cooler component of
the close binary lies on the main sequence near the cluster turn-off, while the
hotter component lies near an extension of the main sequence blueward of the
turn-off, and thus qualifies as a blue straggler by itself. The reduction of
the masses of the stars in the close binary compared to previous models
indicates that it is possible that the more massive component of the close
binary formed from a merger of just two turnoff-mass stars.(abridged)
