It seems not to have been issued. I assume tests survived as they were issued by Pearl on CD, according to DAHR.
From: Association for Recorded Sound Discussion List <[log in to unmask]> On Behalf Of David Lewis
Sent: Saturday, September 08, 2018 6:48 PM
To: [log in to unmask]
Subject: [ARSCLIST] Buhlig plays Bach
Researching for an upcoming radio show I found in DAHR a listing in 1935 for a recording of Art of Fugue by Richard Buhlig as a piano duet. Has anyone seen this? Thanks, David Lewis