This is a correct answer to the following question about Postage stamp. Yes or no?
Answer: Later related inventions include postal stationery such as prepaid-postage envelopes, post cards , lettercards , aerogrammes and wrappers , postage meters , and, more recently, specialty boxes and envelopes provided free to the customer by the U.S. postal service for priority or express mailing.
Question: when were forever stamps introduced
