The processor package was made in Malaysia at the Penang assembly plant.

The chip inside that package was fabbed elsewhere, most probably the USA.

Ah. So what they did at the Penang site was bonding, testing and packaging? (Not sure I'm using the correct terminology.)

That makes more sense now that I think of it. Can't imagine there was a steady supply of electricity there back in the early 70s. (Got any source though?)