This is an HEI type distributor for the small block Ford 289 302 etc.

I used it for about 10 minutes run time to rule out my factory distributor as a  problem I couldn't solve.

Turned out to be the wrong spark plugs.

They didn't reach all the way to the combustion chamber.

It is missing one of the cap hold downs.

A true piece of Chinese junk but it works just fine.

Do your own research but I'm pretty sure this has the hardened gear.