From the American Brahms Society:
The Johannes Brahms Gesamtausgabe in Kiel has posted an article detailing the attempted sale of a forged Brahms autograph by the manuscript dealer Inlibris.
At issue is a forged autograph of Brahms’s canon WoO 29, “Wann hört der Himmel auf zu strafen / mit Albums und mit Autographen.”The dealer has since removed the item from sale, but as it has come up for sale several times in the past, the American Brahms Society is assisting our colleagues in Kiel by alerting the Brahms community worldwide to this forgery, hoping thereby to remove it from circulation.
Full details here.
for reference: this is the forged Brahms