Duel point/ Tech drive

Easy to find out, just "spring" the rotor and see if it moves and springs back. Even if it originally had an advance, someone might have locked it by various means. On most dist's you can see enough by looking through holes in the advance plate and rotating the dist. while looking with a penlight.

If this is an Autolight/ Prestolight factory deal, it probably has a ball top bearing. I once had one in a 440 and it was a 'ell of a good distributor.