Printed in sheets of 50 stamps.
Exists according to the Yvert catalog:
- 无孔 (一个).
Varieties: 421第一: dark blue, 421B: blue-green
Both stamps are distinguished from N° 421 by their colors, but also substantial differences in the engraving.
Features of the landscape in the background more acute, acute-angled right eyebrow, the checkered jacket-less distinct and hatch in the letter R.
