does it not have that cam-driven, make and break circuit that distributes the spark to the right (or left!) cylinder, instead?

Not necessary on a two-cylinder horizontally-opposed engine.

It will have the cam-driven breaker points to build and collapse the primary field in the ignition coil, which then triggers the secondary (the high-tension) output. But at this stage, the spark is sent to both spark plugs simultaneously -- one cylinder is on compression stroke where the plug will actually ignite the fuel charge, the other cylinder is on exhaust stroke where the spark harmlessly fires into the outgoing exhaust gas.

Thus, no distributor (in the sense that the spark is distributed independently to left or right cylinders) is necessary.

tanstaafl.