Your partition type has been set to "FF" which is a Xenix Bad Block Table. Had it been set to "02", that would claim it to be a Xenix file system. But do you really think that your data could be accidentally reformatted into a correctly structured Xenix filesystem?
I think that your data is trashed. But does anyone know of a utility to simply set the partition type? I would just try to set the partition type and see where that leaves me.
Here is a
list of the possible types. It says that FF is just BBT. Here is a
page that supports the view that FF is "Xenix BBT", it's mostly in Japanese, but most of the table is in English.
Well, good luck....I have the feeling you're going to need it...