Two variants of the 254 exist: with transparent ink window (1954-1956) and with blue ink window (1957-1959); the series comprises the sizes 252 (small), 254 (medium) and 256 (large). The 25x models are popular everyday fountain pens with a flexible nib but often suffer from cracks in the cap. Since Montblanc has only been positioned as a luxury-goods manufacturer since 1991 and the 25x were produced in large numbers as everyday writing instruments, the collector value is rather low; in the foreground stand the sentimental value and the good writing quality. With a crack-free cap and transparent ink window, a dating of 1954-1956 can be assumed.