I produced 2 patterned unofficial parts from 3857 "Baseplate 16 x 32 with Square Corners".
Stud orientation used are the same as the official files (parallele to the 16 studs edge).
Photo found on web for patterned parts show the same orientation.
Ok, it's not very clear but i don't find better.
But real not patterned parts I have, show an orientation of stud parallele to the 32 studs edge.
Do you think 2 versions exist with 2 differents stud orientation, one for patterned, one for non patterned, or an old version with an orientation (1990's) and a new version with another orientation ?
Stud orientation used are the same as the official files (parallele to the 16 studs edge).
Photo found on web for patterned parts show the same orientation.
Ok, it's not very clear but i don't find better.
But real not patterned parts I have, show an orientation of stud parallele to the 32 studs edge.

Do you think 2 versions exist with 2 differents stud orientation, one for patterned, one for non patterned, or an old version with an orientation (1990's) and a new version with another orientation ?