These were produced and sold by Warner-Lambert from about 1973 to 1980.
They have "Adjustable by Schick ®" on the metallic insert in the handle. The handle and dial look the same as the previous versions with a few cosmetic changes. Besides the Insert design change, the color of the plastic of the handle and the dial was changed to Grey. The insert on the dial was also changed and had a dot with a cross through it.

The "Protector" function was introduced and they offered two versions - with and without the "Protector". It appears that they sold both versions concurrently. This one has the "Protector" function.
The one without the protector is HERE.