Documented evidence
The verified official register entry lists Bürgi Christoph as registered in the lawyers’ register with the professional title lawyer at Rechtsanwälte und Notare in 1957 SG.
Source
Amtliches Anwaltsregister Kanton St.Gallen · https://www.sg.ch/recht/gerichte/anwalts----notarwesen/anwaltsregister---register-der-notare/anwaltsregister---register-der-notare-a-z.html
Context
This entry reflects only the verified state of the source. It does not imply any further legal or personal assessment.