This is an official USPS envelope from the International Stamp Show in Chicago 1986. Nice and clean. Excellent condition.

I have been lowering my prices every week on everything on all listed items and will continue to do so until inventory is liquidated.  Adding new items daily as well.  All prices go down weekly.  Please check back frequently and consider adding me to your saved sellers.  I offer great deals on combined shipping for multiple item purchases.  Please inquire about cost savings.  Thanks for looking!Please note: Some of my listings mention that I am lowering prices by five percent.  Previously I did lower prices this way on everything from October to August 2023 and many items have already reached the minimum .99 cents. However my primary job has been so busy that I have decided to end it for now.  I might bring regular price reductions back from time to time so please consider adding me as a saved seller and check back every so often. My prices are very competitive and I do send weekly offers.  Thanks for looking!   * I ship stamps in a plastic top loader case and double thick envelopes.  And for added protection I mark envelopes as fragile, do not bend, and non machinable.  Non machinable mail costs more than regular postage and further protects stamps.  I only charge the exact cost of shipping as I realize the cost can be a factor when choosing to purchase.  So I do offer great deals on combined shipping and can typically send up to 40 stamps under $20 combined value in an envelope for listed shipping fee.  Anything more than 40 stamps or $20 value will require a package mailer for $3.99 with no limit to quantity.  * To receive combined shipping deals just add all items to your cart first.  Please do not pay for items separately as it is difficult to send discounts that way.  You can either first send me an invoice to request a combined shipping discount or you can pay first and I will give you a refund for the difference immediately upon purchase.  * Finally if you don't feel like scrolling through thousands of my listings to find what you are looking for I don't blame you.  However you can look at my store and select categories to narrow the search.  And if you have questions about anything please ask.