I’m pretty sure two-stroke oil designated for outboards became common in the early sixties. Possibly around ’64 when everyone started using 50:1 mix. I can remember my dad always having it around for his new ’63 Johnson CD.
Here’s some OMC, Esso and Shell oil.It’s BIA rated TC-W and OMC got out of the Pioneer chainsaw business around ’77 so it’s probably from the mid seventies. The paper Shell container is a real imperial quart (remember those?) with metric printing on it so it’s probably from the early seventies. Our current Prime Ministers father started switching us over to the metric system in 1970.
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