Yes that's the way I see it , looking at the primary winding in the coil the start of the primary winding that is closest to the core is the negative and the other end of the primary winding furthest from the iron core is the positive side of the primary windings.
The primary windings in a mower coil seem to work the opposite way to a car coil probably because the mower coil uses a magnetic field for current flow in the primary windings and a car has a battery for current flow.
