An authentic four-stroke internal combustion engine cutaway model, originally created as an educational and technical teaching aid, designed to clearly demonstrate the internal working principles of a classic piston engine. This mechanically accurate model exposes the key components of a four-stroke engine cycle, making it both an informative instructional object and a highly attractive piece of industrial display. Description This solid metal model features a sectioned cylinder head and crankcase, allowing direct visibility of: piston and crank mechanism intake and exhaust valves valve springs and timing components combustion chamber and cylinder walls The model is mounted on a heavy base and can be manually operated to illustrate the mechanical motion of the engine cycle. Condition The model is in fair to good vintage condition, showing: visible wear, paint loss, and surface oxidation signs of long-term use typical for workshop or classroom equipment no attempt at restoration, preserving its original, honest industrial character Despite cosmetic wear, the model remains structurally complete and visually effective as a demonstration piece. Historical & Collectible Value Such engine cutaway models were widely used in: technical schools engineering faculties vocational training centers industrial exhibitions Today, original examples are increasingly collected by: industrial design enthusiasts mechanical engineers and educators collectors of scientific and technical instruments interior designers seeking authentic industrial décor Dimensions & Material Material: cast metal and steel components Era: mid–20th century (approximate) Function: educational / display model Please study the photographs carefully, as they form an integral part of the description and accurately reflect the condition of this item. All items featured in our auctions, including this original four-stroke engine model, are sourced directly from our private collection at OldMoneyWatches. We are dedicated collectors with a passion for rare and significant technical and historical objects. Bid with complete confidence; you are purchasing from a trusted seller with top-rated reviews and a proven track record for authenticity, honesty, and careful shipping.