pardon me if i missed anything that was posted earlier.
The first porsche was a 1/12 scale. if you got the latest copy of RC WORLD with you it clearly picture the 2 cars (first one and the anniversary edition) side by side.
First 1/10 sedan was a skyline, I remember that I saw an article on this in RC Car Action back in late 90s. (1996?) and I thought only TA02s came with red colored gearboxes? I could be wrong though but pretty sure tamiya's first one was skyline.