The Collegium Ars Scribendi (CAS) is a collectors' association founded in 1996 around high-quality writing instruments, whose members receive preferred access to special editions and joint edition sets. Information about the association can be found at cas1996.de. The Pelikan Originals of their Time series comprises several models issued in parallel (1931 with 18-carat gold band, 1935 in green and blue celluloid, 1931 in white gold doublé, 1931 with Toledo band) with different limitations, which can especially be collected as a set with identical edition numbers.