China 1982 STAMP set T73 mint

Minerals

Technical details:

Scott No: 1799-1802
Serial number: T73
Values in set: 4
Date of issue: August 25, 1982
Denomination: 42 fen
Designer: Xu Yanbo
Size of stamps: 30*40mm
Perforation: 11.5*11
Sheet composition: 80 (10*5)
Printing process: Photogravure
Printing House: Beijing Postage Stamp Printing Works

SN: (4-1)
Title: Orpiment
Values: 4 fen

SN: (4-2)
Title: Stibnite
Values: 8 fen

SN: (4-3)
Title: Cinnabar
Values: 10 fen

SN: (4-4)
Title: Wolframite
Values: 20 fen