art, he's saying FROM 83, as in 1983
They never built an 83 model, closest type designation is an explorer 80
Having 50 hp (PTO ??) i expect it to be an explorer 65, which was AFAIK the smallest of the explorer range.
You should be able to find parts through a good Agco dealer, as Agco sold these models for a while as Agco Allis and White.