Ha! Using 'The Scientific Method', I must infer! (which makes this response another 'Did Not Use The Scientific Method' situation)
It's the Pertronix coil that came with an FBO kit, which they say is a 40011. It does measure 1.5-ohms. That number matches the 40011 specs on the Pertronix website. On the coil label it says '1.5-ohms'. The label does NOT show a 40011 number.