China R31 - Chinese Birds (Issue II)
The second issue of the Chinese Bird definitive series revealed April 1st with two values: 4.20 yuan Phoenicurus alaschanicus and 5.40 yuan Emberiza koslowi.  The series, believed to be among the most high-tech.stamps ever printed by China debutted February this year.
 
Date of Issue April 1, 2002
Denomination and Design 4.20 yuan Phoenicurus alaschanicus
5.40 yuan Emberiza koslowi
Designer Huang Huaqiang
Editer Lui Yushu
Size 27x38mm
Perforation 13.5x13
Paper Stamp paper with fluorescent fiber
Printing Process gravure, four color, micro-printing
Sheet Sheet of 30
Printer Beijing Stamp Printing House