Yup, after Weber(Italy) quit making DCOE's in the late 70's-early 80's. Someone needed a replacement for the market.
SK's came about. Sold by the outfit in California that had manifolds and carbs and other stuff, not that far from Moss in Goleta.
Japanese version of a DCOE.. Most of the parts were interchangeable, but they were designed mainly for competition, where a Weber could be set up nicely for the street.
Then they quit being produced, especially after Weber started being built in Brazil and Spain and other places.
But, last I looked, Pierce manifolds has found a source for SK's again.