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As written (in parentheses) on the back cover below catalogue number: II IZDANJE - second issue of the first (PGP) RTB record ever (originally released 1959). At that time, at the very beginning of the record company, its name had been only RTB, same as the name of the holding company - Radio-Televizija Beograd = Radio-Television Belgrade. Some years and LPs later, it became by far better known PGP RTB - Produkcija Gramofonskih Ploča Radio-Televizije Beograd = Grammophone Record Production of Radio-Television Belgrade (a division of RTB holding company).
Two tracks are Serbo-Croatian covers of 1958 hits by Tony Dallara: track A4 of Per un bacio d'amor composed by R. Poes, and track B3 of Brivido blu, composed by Giuseppe Pino Spotti, with misspelt Italian title in parentheses on back cover.
Track music styles as given on back cover: Fox (A1 and A2), Medium Swing Night (A3), Slow Rock (A4 and B3), Medium Swing (B1), Swing (B2) and with no such datum given for track B4, obviously Mambo concluding out of its title.
Matrix / Runout: M-30-349/350 (Matrix numbers on back cover)
Matrix / Runout: M30-349 (Matrix on side A centre label)
Matrix / Runout: M30-350 (Matrix on side B centre label)
Matrix / Runout: 34 (further marks masked with the label) (Runout side A (etched))
Matrix / Runout: 501 350 B (Runout side B (etched))