Some can be as low as $20 and some as high as $150.
Many of the silk maps(most made of rayon) printed for Japan and the invasion of Japan were never used. So there is a large surplus of these and their value is less than a silk map of Europe or an early one printed actually on silk.
See link: www.silkmap.com
try ebay
see ebay
One method is to take one thread sample from the map and burn it. Rayon will melt but silk will burn. Most "silk" maps made in WW2 were actually rayon. A few of the early maps were silk and these were usually crude maps and not in color. In 1943 the British also began using viscose rayon and cuprammonuium, a form of rayon commonly known asBemberg silk or copper rayon. The following site identifies most of the escape maps used by the Americans and many of those used by the British. http://www.escape-maps.com/
Silk
Silk.
It was imported from the Orient which was at war
You could get the World at War zombie maps if you pre-ordered a special edition. The multiplayer maps are not available.
some maps are castle,upheavel,cliffside,and downfall.
Sonar, RADAR and satellites and space travel improved the accuracy of maps after World War 2.
What is the value of a world war 1 trunk
cotton or silk
Custom maps are only available for PC.