Up for auction is an authentic vintage Olympiacos Piraeus home shirt by Umbro from the 2003/2004 season, featuring the iconic 'Siemens Mobile' front sponsor, embroidered Umbro logo, and stitched three-star club crest. The reverse features the name and squad number 5 of French World Cup and European champion Christian Karembeu, finished with the integrated Umbro diamond logo at the base of the numeral. ​The shirt has an approximate weight of 230 grams. It does not include an original retail box or packaging, but it remains in very good vintage condition, exhibiting bright colors, intact fabric, and well-preserved front and back printing. ​This is a 100% genuine, officially licensed Umbro football shirt, confirmed by the internal production and wash tags showing manufacturing code 961/030. The inner label confirms the shirt was 'Styled in Europe'. The piece is unsigned, originating directly from a private football memorabilia collection. ​High-resolution close-up photographs of the stitched club crest, Umbro chest branding, collar structure, inner production tags, and Karembeu 5 back print are provided to verify full authenticity and condition. ​The item will be securely wrapped in protective packaging and dispatched promptly via registered, insured tracked shipping service (e.g., DHL / DPD / PostNL