The Meisterstücks of the 1950s consist of celluloid, not acrylic, which is why agents like Displex must absolutely be avoided — they attack the surface and can outright decompose it. Wenol with its fine abrasive particles has proven itself; it delivers a smooth surface without aggressive dissolving and is available in automotive or specialist trade. Displex by contrast is well suited for modern Plexiglas writing instruments. With good preservation of the piece, only restrained polishing is recommended in principle.