I believe that the original distributor has been replaced by a "will fit" unit. Originally, the whole M133, M135, M207, M211, M215, M216 M220 etc. series were fitted with waterproof electrical systems in line with the thinking of the period that MVs should be able to be driven submerged. In these systems the coil and distributor were in a single unit with waterproof enclosure. Similarly the spark plug wires had screw down connectors at each end with gaskets to keep out the water. All very nice while it worked but awkward and expensive for people using the trucks after purchase from the government so often replaced with the equivalent parts off a similar civilian motor (and a pain for restorers who seek original). Bottom line, the system on your truck isn't original but will make it easier for you to maintain in the short run.
It also looks as if the sealed voltage regulator has been removed, perhaps for similar reasons. Maybe more of the electrical system too. If they did gut the electrics, they may have substituted 12 volt civil equivalents which might make the original 24 volt gauges read wonky.
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