LBT-0712A Map Case:
Made from 420D Olive Drab nylon pack cloth. The LBT-0712A map case was meant to hold a topographical map as well as small items such as a combination ruler/protractor, pens and pencils. It can be folded to fit in a BDU pocket (source: http://webbingbabel.blogspot.com/2017/05/london-bridge-lbt-0712a-map-admin-case.html).
Gold label tag with a 757 area code phone number was introduced in 1997 (source: https://www.facebook.com/groups/1942461055884525/posts/2302310143232946). The Fort Sherman, the US Military Base in Panama shown on the map, closed in 1999 (source: https://www.latimes.com/archives/la-xpm-1999-mar-26-mn-21238-story.html). This is how the date range in the page title was derived.
1982 date. The map shows the area around Ft. Sherman, on the northern (Carrribean) side of Panama. Fort Sherman was the location of he Jungle Warfare School (source: https://www.latimes.com/archives/la-xpm-1999-mar-26-mn-21238-story.html). Panama City, where most of the fighting took place during Operation Just Cause, the invasion of Panama (December 1989 – January 1990), is south of the area covered.