Like the Gasplane, there is a great deal of variety when it comes to the markings found on the Gasplane pouch.
Generally early war examples will have very detailed markings shown the name and location of the manufacturer, the date of manufacture and inspection stamps. Mid war examples usually have an opaque combination of batch number, code used by the manufacturer and perhaps a year of production. Finally there are many examples with no markings at all.
The examples shown here illustrate the typical examples found.