Acknowledged, but not listed by SG, Soloviev or Zagorsky.
Issued in sheets of 25 (5 乘以 5) - 21 stamps and 4 labels.
Labels are located in 1st, 5th, 21st, 25th places of the sheet.
Issued in sheets of 16 (4 乘以 4) - 15 stamps and 1 label.
Label is in position 4.
