interesting - would you re-check and please share a photo of it?
i don't have original copy of Tusk, but seems that everywhere else but on that original copy of yours producers of Tusk are Fleetwood Mac, Ken Caillat, and Richard Dashut
https://www.allmusic.com/album/tusk-...190000/credits
Fleetwood Mac
Tusk
AllMusic Rating 10 User Ratings (1,582)
Credits
Artist Credit
Peter Beard Photography
Dave Brolan Project Assistant
Lindsey Buckingham Composer, Group Member, Guitar, Quotation Author, Track Engineer, Vocals
Patrick Byrne Crew
Ken Caillat Engineer, Producer
Richard Dashut Engineer, Producer
Jason Day Project Supervisor
Kate Dear Project Supervisor
Sheryl Farber Project Assistant
Rich Feldman Assistant
Fleetwood Mac Primary Artist, Producer
Mick Fleetwood Drums, Group Member, Percussion
Tim Fraser-Harding Project Supervisor
Lisa Glines Project Assistant
Daniel Hersch Remastering
Bill Inglot Reissue Producer
Jim Irvin Liner Notes
Mike Johnson Project Assistant
Raymond Lindsey Crew
Christine McVie Composer, Group Member, Keyboards, Synthesizer, Vocals
John McVie Bass, Group Member
Stevie Nicks Composer, Group Member, Vocals
Jayne Odgers Photography
Ken Perry Mastering
Hernan Rojas Assistant, Engineer
Norman Seeff Photography
Amanda J. Smith Repackaging Supervison
Matt Smyth Project Assistant
John Strother Project Assistant
Olivia Thomas Product Manager
Greg Thomason Crew
Vigon Nahas Vigon Art Direction, Design
Mike Wilson Project Assistant
Rory Wilson Reissue Design
Steve Woolard Reissue Producer
and yes, because Lindsey is NOT listed as a producer on Tusk while he did the work, while FM as a band is listed as a producer, band did give him "special thanks" for basically taking his producing credit.