Crappy phone camera, so my shots aren't as nice as RedToo's but I can concur about the linen thread backing.
Thought I'd post this shot as it's where all the screen shots have been taken
Map is printed on heavy paper reinforced with linen thread.
Here is a worn area in the fold showing the thread.
Until the boxed version arrives guess which map I'll be using personally...
The large red dots are airfields, the small red dots along the coast and in villages are balloon sites.