Genealogy.net has Hubert from Hallgarten, researched by someone from Koeln.
https://gedbas.genealogy.net/person/show/1130704880
GEDBAS is a project where researchers can upload their GEDCOM files and contact others.
There is another contributor there (also with contact-address), who specifically names "Nikolaus BUCH" and "Christina"
as Hubert's parents. Maybe he knows more ??
http://gedbas.genealogy.net/person/show/1204200426Regards,
Bob
ps. It's a german site; it may come up in english with an english-language operating system, but if not:
- on the left of the page, in the box "Funktionen" you can change the language to englisch "Sprache wählen", the home page will then come up again.
- enter 'Buch', 'Hubert' and 'Hallgarten' in the search box.
- the link I gave above is the third one (dob: 1662) and in the "Notes to this person", the submitter seems to have copied ('Quelle' = source) something from "Weingut Kurt Bug" !!
Maybe that was from the firm's promotional material ? ("Weingut" = Vineyard, Vinery)