1962 NEC
250-60 Frames of Electric Ranges and Electric Clothes Dryers
Frames of electric ranges and electric clothes dryers shall be grounded by any of the means provided for in sections 250-57 and 250-59 or where served by 120-240 volt, three wire branch circuits, they may be grounded by connection to the grounded circuit conductors, provided the grounded circuit conductors are not smaller than No. 10 AWG. The frames of wall-mounted ovens and counter-mounted cooking units shall be grounded and may be grounded in the same manner as electric ranges.
Size 8 SE cable can be bought with a size 10 bare conductor. When I first started in the field a couple of years back #8 SE came with #10 bare unless you requested different. I haven?t bought any lately so I am not sure about it now.