Original solid-gold writing instruments typically bear the 750 stamp in several places: on the crown, on the cap, on the barrel, under the clip and on the nib; each of these parts is individually hallmarked, since otherwise an exchange would not be traceable. With early solid-gold pieces, however, partly only barrel and cap are hallmarked, and some early models still have the normal (non-gold) clip fitted, because the pure gold clip was mechanically unsuitable — the marking helps with classification here. Vermeil writing instruments, on the other hand, are marked with "925" (sterling silver) and partly the "StO" stamp. If both "750" and "925" appear on a piece, one should keep one's distance.