This vintage box of 400 window envelopes is a must-have for any stamp collector. The envelopes are NOS and measure 5"x3". They are perfect for protecting your valuable stamps and keeping them organized. The box is in great shape and has been well-preserved over the years. It is a rare find for any collector and a great addition to any collection. The envelopes were manufactured in the United States, adding to their unique and historical value.

Envelope measures 5"x3" - Window measures 3.625" x 2"