
Portuguese post start issuing personalized stamps on October 9, 2007. They are called "meuselo" (mystamp) and similar to the spanish ones, sticker type.
Image shows a copy of the personalized stamp I've ordered to promote my Delcampe store. I've choosed the same image I have there, the old coat of arms from the Mozambique Company, with the portuguese arms sustained by two elephants.
The "N 20grs" denomination means this stamp is valid for franking inside Portugal for items up to 20 grams.
The actual face value for it is only 0.30€. However, they are more expensive to order because portuguese post charge a fee for the personalization.
This stamps are also accepted for international mail with additional franking for the remaining value.