Straight line engine turning is the craft of mechanically engraving precise repeating geometric patterns onto metal surfaces – the hallmark decoration of Fabergé eggs, Cartier watch cases, Zippo lighters, and Waltham pocket watch dials. This cross-slide is the heart of such a machine: it provides precision two-axis (X/Y) movement of the work piece under the cutting tool, controlled by micrometer-grade lead screws. This type of machine is considered among the rarest of antique precision instruments. Complete working straight line engines are museum-quality pieces; individual precision components like this are eagerly sought by the small but dedicated global community of active guillocheurs and ornamental turners. Full precision cross-slide assembly with X and Y axis movement. Heavy cast iron base – solid and stable. Dividing/indexing head with brass gear and lever handle for precise angular positioning. Multi-position tool post with adjustable gravers/cutters. Brass and steel construction throughout – high quality European manufacture. Multiple locking screws, adjustable stops, and fine feed controls. Very good antique working condition. Impressive precision and heft. Natural age patina throughout. No visible cracks or damage to the casting. Maker’s mark not identified – please examine photos carefully and inquire if you need additional detail shots. Origin: European (Swiss or German), likely late 19th / early 20th century. This is the cross-slide assembly only – not a complete machine. This piece is appropriate for. Active guillocheurs seeking to build or restore a straight line engine. Ornamental turning collectors. Horological instrument collectors. Museum and decorative arts institutions. Jewelers and watchmakers working in traditional techniques.