Help with dampener ID

This is a 360 balancer. They did make one without the offset as yours has. I believe it was early. I am sure someone has to make one for your application to replace early parts. It is not a good idea to use originals that are 30 plus years old. The rubber holding the two pieces together is Known to fail from age. If this happens it could cause severe damage. I've seen it. When the crank is spinning the damper it causes inertia, any sudden stall of the crank from what ever, as a gear change can cause the outer to keep spinning, and there it goes. Would you put 30 year old tires on your car after a resto.