A restored 134 is well usable as an everyday fountain pen, provided cap and barrel are undamaged; one should write a little more carefully than with modern models. With writing instruments made of celluloid, only water-soluble blue ink (e.g. Pelikan 4001 royal blue) is recommended, since other inks can attack the material. The cork seal must not dry out: with regular use this is unproblematic; with longer non-use, the fountain pen can be filled with water or ink so that the cork swells; new corks boiled in paraffin are largely insensitive to shrinkage. When carrying it, ink can occasionally leak at the grip section (more strongly with the 124 than with the 134). Compared to gold nibs, there are no special care instructions for the steel nib.