You're onto something there, anon.
Now, find a 1920's/WWI era similar map (almost always a >>>/hr/3067781
thread running), well-aged & worn like it's been stashed in the jungle shack of a long-dead, shipwrecked sailor for a century. I'm sure Monarch has the original find stashed in their archives somewhere.
The resolution on >>7190274
is fantastic, looks glorious on a 32" 2560x1440 monitor. Loved the Skull Island crossover reference.
Thank you for your kind contribution.