ABU 5000C, 106XX

I collect black ABU Ambassadeur 5000C reels, and would like to keep a record of their differences with foot number and/or production age. This is one of the earliest 5000Cs I have in my collection, and its foot number is 106XX, which has 4 pillar screws on the left side plate, Oil-Oil marked handle nut, black (oxidized silver) emblem, and dotted inner plate. The center core (arbor) of the spool is silver. This reels was presumably made in 1967.