The value of Master Mystery posters vary depending on whether the artwork features escape imagery or The Automaton. As you see here, this poster has a wonderful image of The Automaton (said to be cinema's first movie robot), and those skulls are pretty sweet too! The auction listing also included this interesting nugget of info:
The fact that this is 2019 is also significant! That is because this is no longer a "collectible movie poster", but it is now an "antique movie poster", because just about everybody defines an "antique" as being a century old, and this poster now is a full 100 years old.
In 2013 eMoviePoster auctioned a one sheet from The Grim Game for a whopping $67,166.