The reverse of this Silver medal showcases the iconic 434.1100 "Čtyřkolák" locomotive in detailed relief, capturing its powerful form and the intricate engineering that defined Czechoslovak steam traction. Around the motif appear the inscriptions referencing the locomotive's designation and historical context, including "JEDNIČKOVÝ ČTYŘKOLÁK", "270.300", and "ČESKOSLOVENSKÁ PARNÍ TRAKCE". A subtle holographic element beneath the train highlights the year 1920, marking its period of operation. The obverse features a complex mechanical composition of railway elements-tracks, signals, levers, and a large steam-engine wheel-arranged in a circular technical diagram. Also included are the inscriptions: "1 oz Ag 999" - metal content and purity, "2025" - year of issue, BCM - mintmark, "OPPL" - issue code.
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