That is the MBR partition table, it resides in the first 512 bytes of the disk.. OpenBSD's disklabel resides within the MBR partition.
I can't explain how things got mangled like that, but a copy of it would have resided in /var/backups.
Does /var/backups/disklabel.wd4.current have what you need?
EDIT: J65nko may have spotted further issues, full output from commands in [code][/code] blocks would be appreciated.
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