China 1958 STAMP set S22 used

Early Fossils of China

Technical details:

Scott No: 341-343
Serial number: S22
Values in set: 3
Date of issue: April 15, 1958
Denomination: 28 fen
Designer: Wu Jiankun
Engraver: Kong Shaohui
Size of stamps: 23*28.5mm
Perforation: 14
Sheet composition: 130(13*10)
Printing process: Engraving and photogravure
Printing House: China Modern Times Printing Works

SN: (3-1)
Title: Trilobite of Haoli Mountain (Paleozoic)

SN: (3-2)
Title: Dinosaur in Lu Feng(Mesozoic )

SN: (3-3)
Title: Megaceros Pachyostens(Cenozoic)