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I've never seen a Sentinal set so I'm operating in a vacuum here.
I could guess at least two methods. One requires a special tuner. The other maybe.
You have four bits which could generate 16 codes and you only need 12. They could switch relays that switch in capacitors and coils. But, the code you show doesn't make sense for that.
The other possibility would be using a motor as you suggest. The shaft that the motor turns would turn a switch with a common wiper that generates the compliment of the code that you show. The wiper would be connected to the motor and the motor would turn until the switch reached the compliment value. There would be no matching on state on the two switches to power the motor.
The potentiometer could control a reactance tube for the fine tuning.
John
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