PIAGET Tank Ref 9228 men's watch from the 70s. 18K white gold. Serial number 270499, hand-wound cal. 9P1 movement with good performance (+3 s/d. 251° amplitude). Gray dial with Roman numerals and railroad minute scale. The watch received a new revision in July 2025. Crown with blue sapphire cabochon. New leather strap with pin buckle. Used condition with visible signs of wear on the case and dial (slightly damaged). Proof of revision enclosed. Diameter approx. 23 mm (measured without crown).