4 Old Small Colorado Bureau of Mines Fabric Specimen Mailer Bags. 5.75" X 4"

Description

4 Old Small Colorado Bureau of Mines Specimen Bags.
5.75" x 4" bag with attached
3.75" x 3" address tag.
New, never used.  Sold at the mine gift shop to ship purchased minerals in. 1960's era.
Two of the bags are missing a number from the zip code of the mint. See photos.
One of those bags also has minor rust staining.
Haven't tried drawstring. I do not think it will work.
First class USPS shipping.