There was a lot of aftermarket parts made in Sweden in the '60's and '70's and the only way to know what it was is going through old Swedish catalogs. Even there, a lot of these things were made for / by custom gunsmiths and it's often impossible to get more info now that these people are long gone.
I assumed that since the body of the safety switch is made from some sort of ancient plastic, it had to have been at least semi-mass-produced. But maybe not. I'm not sure how easy or hard it was to produce just a few of these parts.
Having taken the housing of the safety switch apart and examined it under magnification I have found enough tiny file marks for it possibly to be a one-off prototype or at least a very low production item.

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