Someone helped me out a while back on the number of different "flips" that SGC has issued over the years...

(1) SG on the front
(2) SGC on the front, but no 1-10 grade
(3) SGC on the front with 1-10 grade + gold label on the back
(4) SGC on the front with 1-10 grade + SGC pressed into the back

So my question is - Does anyone know what years were associated with each flip change?