10 Yen - Shōwa 23mm pattern, security edge

Historical Context: This 10 Yen pattern coin originates from the Shōwa era, specifically Japan's post-World War II reconstruction under Emperor Hirohito. The war devastated the economy, necessitating a complete currency overhaul. Pattern coins like this 23mm nickel piece represent the Japan Mint's experimental phase, exploring new denominations, compositions, and security features. Its creation highlights the meticulous planning to stabilize the economy and restore public confidence.

Artistry: While specific engraver attribution for this pattern is typically unrecorded, the design likely originated from the Japan Mint's skilled artisans. Post-war Japanese coinage blended traditional motifs with a modern, functional aesthetic, prioritizing clarity and durability. The 23mm diameter and nickel composition suggested a robust coin. Its design aimed for immediate recognition and enhanced security. The "security edge" is a crucial design and technical feature, intended to deter counterfeiting.

Technical/Grading: For this 23mm nickel pattern, key high-points for grading would be found in the intricate details of any central motif, ensuring full separation of design elements. Pattern coins often exhibit superior strike quality, showcasing the die's full potential with sharp, crisp details across fields and devices. Crucially, the integrity and precision of the "security edge" are paramount. Any weakness in its execution would significantly impact its technical assessment and overall grade.