Those are not the correct coils, and that was not done by the factory. All of the coils for this game would be labeled as Williams coils. At some point, someone put Gottlieb coils in the machine.
The correct flipper coils for this game per the schematic are FL20-300-28-400.
However, as zacaj points out, it may be that the entire flipper assembly was changed out to use Gottlieb parts, in which case it would probably be complicated to put the original coils back in.
- TimMe