Circle Scribble - also referred to as - "Semi-airbrushed". Very rare version. Circular dark scribble pattern - still showing several letters (the Fs are completely visible). Easily the #1 hardest version (s) to locate.
Found in a few levels of darkness or coverage. I refer to these as CS1, CS2, CS3 & CS4. All have been located with both sawcuts and without. Generally, more are found with the sawcut. Populations? As of June 2018 - I've seen about 3 dozen of the CS1s (only two without the sawcut), about 5 of the CS2s (only one without the sawcut), six CS3s (2 uncut, 4 w/ sawcut) and six CS4s (3 uncut and 3 w/ sawcuts).