The above Rambaldi (original) is keymarked by its watermark "eye" <o> over the gear-like mechanism and characteristic aging lines on the proprietary onionskin. Coloration and striation lines match the direction of the scrolls (all sketches were stored scrolled top to bottom.)

 

This falsified Rambaldi, below, from Germany, is recognizable by its lack of watermark "eye" and uneven aging lines (vertical) on a substandard parchment. Scale of drawing is crudely altered, and does not conform to Rambaldi's standardized system of geometrics. Coloration and striation lines also *do not* match direction of scrolls.