We are lucky there is an imbibition print of Star Wars at all. Star Wars would have been the last big release to get an IB print I would wager.
Technicolor had already stopped producing IB prints at all in the early 70s, All Star Wars IB prints were produced at the one remaining facility in the world, in the UK. They shut down in 1978 and sold the gear to China. Had that happened a year earlier, there would be no IB prints of Star Wars for us to try and find.