China 1954 STAMP set S10 used

Seamless Steel Tubing Mill and Heavy Rolling Mill

Technical details:

Scott No: 229-230
Serial number: S10
Values in set: 2
Date of issue: October 1, 1954
Denomination: 12 fen
Designer: Sun Chuanzhe
Engraver: Gao Zhengyu, Song Guangzeng
Size of stamps: 21*32.5mm
Perforation: 14
Sheet composition: 108(12*9)
Printing process: Engraving
Printing House: Beijing People's Printing Works

SN: (2-1)
Title: Seamless Steel Tubing Mill
Value: 4 fen

SN: (2-2)
Title: Heavy Rolling Mill
Value: 8 fen