29.11. 1967: Partizan vs Leeds U.
Referee: Doǧan Babacan; Linesmen: Macit Sarıdana & Talas Müşfik [Turkey]
Oddly enough, I saw the game in December 1968 between Leeds U. and Hannover 96. The programme did indeed give no information about the match officials, and memories of stadium announcements from 52 years ago may carry little weight, but for what it's worth, memory and some digging around suggest that one of the linesmen may have been José Ruiz Cassasola.