Most of the serial #'s on the bags are miscellaneous and will be mixed.
Buttons, straps, and shading vary as well.
Note: Serial #'s vary from bag to bag.

Old style “salt & pepper” cotton duck. Comes with shoulder strap and can be worn on the shoulder or on the belt. This bag has 2 small interior compartments for organizing your gear. 
Great for cameras, first aid kits, and purses. 
9″ tall x 9″ long x 5″ wide. 
New old stock Original Swiss Surplus.
These have been inside burlap bags for many years. From storage wear, there has been some browning from the burlap onto the gas mask bag.
A very vintage look to them.