Looking at the subject lever's laminated stamped steel construction, I am recalling servicing one PX10 from early 1970 having the earlier 1960's style of decals. Recalling these were a double set of DT levers with hard plastic lever tips somewhat like Huret Jubilee.
I think this method of constructing their levers was over a brief period of production, perhaps one year or so.
Shown below at center: