Alternatives: Six-O-Three, Six-O-Threes
A communist aerodynamically shaped presidential limousine, brand name Tatra 603.
No sooner had Bruno stepped out into the street than two filthy Six-O-Threes came scooting past. (Source: J∙ Okram - The Mystery of the Rammed Key.)
Slovak / Slovenčina (SK): šesťstotrojka
Czech / Čeština (CZ): šestsettrojka