The minimum was 2 splits - 4 circuits. -- actually just checked
1969 code and it just specifies 2 circuits dedicated to countertop appliance receptacles - at least one in each working area - no 2 adjacent outlets connected to the same branch circuit. Grounded polarized plugs were specified in 1969 code.Looking at my 1966 code book I believe it is the last code that specifically called out specifications for knob and tube wiring, Grounding was required for all circuits, non-metallic sheathed cable, open wiring, or knob and tube in 1966. The kitchen requirements were the same in 1966