What are the key factors that determine the value of a collectible stamp, and how can collectors assess them?
How has the role and design of stamps evolved with the advent of digital communication and electronic postal services?
What are the differences between definitive stamps and commemorative stamps, and how does each serve the postal system?
How are commemorative stamps designed and selected for production, and what criteria are used to determine their themes?
What are some of the most valuable and rarest stamps ever issued, and what makes them so sought after by collectors?
How did the introduction of adhesive postage stamps revolutionize the postal system?
These questions cover a range of topics from history and philately to modern technological impacts on stamps.?
5. **What measures do postal services implement to prevent forgery and ensure the authenticity of stamps in circulation?
4. **How have modern technologies, like digital printing and QR codes, influenced the design and functionality of postage stamps today?
3. **What are the differences between definitive and commemorative stamps, and how do they serve different purposes within postal services?
