China 1952 STAMP set C15 unused

International Labour Day

Technical details:

Scott No: 138-140
Serial number: C15
Values in set: 3
Date of issue: May 1, 1952
Denomination: 24 fen
Designer: Sun Chuanzhe
Size of stamps: 16*26mm
Perforation: 12.5
Sheet composition: 144(12*12)
Printing process: Offset
Printing House: Shanghai Huadong Revenue Printing Works

SN: (3-1)
Title: Hook and hammer
Value: 8 fen

SN: (3-2)
Title: Hand of peasant and worker
Value: 8 fen

SN: (3-3)
Title: Hammer and chimney
Value: 8 fen