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That is a Steel GT seat from a 356 (T6) 1962-65
I have the same seats in my 1962 Twin Grille Roadster.
That is a 356 B/C (T6) GT seat which is basically a speedster seat but a little bit wider and covered differently. Why it was covered differently was always a mystery. On the GT seats the bottom cusion was a little longer and the top material continued over the back of the seat by about 3 inches...
All of the original aluminum GT seats had steel side panels riveted with round rivets like the one Warren Eads makes...
The seat frames on the 356 GT seats were all steel and were continued and were almost identical on the early 911.