Caracature of Claudio from an album cover, 1999.

 VIDEOGRAPHY:  Video Stills From Broadcast TV:

Frank Sinatra: The Reprise Collection - A Man and His Music + Ella + Jobim
From a television special from the late 1960s:

Sinatra and Jobim sang a short medley of Jobim songs arranged by Claus Ogerman and played by
Nelson Riddle and His Orchestra. Claudio Slon was the drummer for this tv special which also included several numbers sung by Sinatra and Ella Fitzgerald.

Though he cannot be seen on camera in the above and below photos, Claudio confirmed that this is his bass drum & tom-tom where the red arrow is pointing.  
During this medley, Claudio was playing almost directly to the left of Sinatra.