ChatGPT: 了解しました。 いただいた画像・情報（ケース幅31mm／腕周り20cm／厚み4.7mm／ボーイズサイズ／STAINLESS STEEL BACK／シリアル21304626／箱あり）を反映して、Catawiki にそのままコピペできる商品説明を作成しました。 Longines – Quartz – Boys' Size – Gold Plated – 31mm – With Box A refined vintage Longines quartz watch featuring a classic white dial with Roman numerals, a slim gold-plated case, and an elegant black leather strap. The square-cushion case design and ultra-thin profile give it a timeless dress style suitable for both men with small wrists and ladies preferring a medium size. The watch is fully functional and keeps time correctly. Comes with a box. Condition • Overall: Very good • Case: Gold-plated, minor signs of use • Crystal: Clean • Dial: Very clean, no noticeable marks • Hands: Original, very good • Crown: Original • Strap: New aftermarket leather • Back case engraving: "STAINLESS STEEL BACK / 21304626" Functionality • Quartz movement – working properly • Timekeeping confirmed • Battery replaced (current) Specifications • Brand: Longines • Model: Quartz • Gender: Boys' / Unisex small • Movement: Quartz • Case size (without crown): 31 mm • Thickness: 4.7 mm (ultra thin) • Lug width: 18 mm • Wrist size (max): approx. 20 cm • Case material: Gold-plated with stainless steel back • Dial: White with Roman numerals • Shape: Cushion / Square-round • Country of origin: Switzerland • Serial number: 21304626 ＃1945 **Shipping** – Ships from Japan via FedEx or DHL (tracked & insured) within 3 business days. – Secure packaging with bubble wrap and box protection. **Return Policy** – Returns are accepted within 14 days of receipt, provided the item is in its original condition. **Important** – Customs duties or import taxes may apply depending on your country of residence. Please check your local regulations before placing a bid."