According to Official Guinness Records,
The world’s largest rubber stamp seal is 1.3m (4.26 ft) tall and 1m (3.28 ft) in diameter, made from walnut, cherry and rubber, and was unveiled at the Brand of Year Awards in Kiev, Ukraine on 6 June 2002. It weighs 102.6 kg (226.2 lb).
For a complete list of 2002 records, please visit 2002 Guinness Records in Ukraine.