Oh no, Angry Scientist! That 82 Ishiwata Trek may have a “death fork”. I too have an 82 412 model and am planning a build. I’m not particularly concerned as mine has no rust. Don’t mean to send you down a rabbit hole, but many posts on this. Just a heads up in case you are the nervous type. Research to me was not conclusive regarding the whole batch and various conditions of preservation or use.