Thanks for the answer. Am I correct that the 0.63€ stamp has been issued instead on 4/1/13, meaning 10 days before the tarif change ?
I also find blocks of 5 for the 0.63€ stamp..., so I assume the block was intentional, correct ?
The 0.60€ block sells for at least 260€. I could, at least, not find any cheaper offers on
ebay or Delcampe ?