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.