Macau Macao 2000 1th Anniversary of Macao SAR S/S with certificate

https://www.delcampe.com/en_US/collectibles/stamps/macau-1999-chinese-admnistrative-region-unused-stamps/macau-macao-2000-1th-anniversary-of-macao-sar-s-s-with-certificate-476842302.html