ISO

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ISO is the short name for the International Organization for Standardizationᵂ. The letters ISO were chosen as a language-neutral nickname for the organisation.

ISO is cast on various Datsun parts, like this choke cover
Album 24890

The ISO mark started appearing on Datsun parts around 1968 and became rare around 1974. For instance, the original Datsun B10 parts did not have ISO but some revisions started getting it.

The early B110 fuel pump was not listed as ISO, but the revision was listed as "ISO screw" in the factory parts catalog.