Yes that foreign Steel that was used from around 1975 (was it Spanish or Italian sourced?) was responsible for more rot on later cars
The ziebart treatment should have helped though with this one
Mileage quite high but then again it is 37 years old!
I saw a gorgeous Sprint a few years ago at the TSSC Stafford show, it was finished in one of the Stag colours, the yellow/orange colour, not Topaz, can't remember the name
Had a brief chat with the owner, it was a low mileage one and he'd bought it when a couple of years old, it was a Gem and like new inside.
Always liked them, maybe one day