I just bought this Cab with a Super PA Plexi Head. All Speakers are working fine as well as the head. T1221 Celestion Speakers Date code 3x 28HA + 1x 16HA I can read on the cone 102 003 on 3 of them, I couldn't read the last one (believe to be re-cone) What do you think about it? does-it look all original? Is-it from end of 1967, 1968 or earlier? Is-it a 1960, 1982, 1935 or other?