Quoted from AlexF:The trouble with commercial art is the artist were not in it to be famous or gain recognition.
Also some of the time, they might have been told to emulate a previous artists style.
So that is why some of the games look like they were done by (say) Molentin,
but for some reason they look just a bit off or not up to that artist's normal standard.
Still would like to know for sure, as time is running out, as more and more of people that might know
are now dead or too old to remember with clarity.
Also the fact that some of those studios that produced the art for pinball burned down and probably any records lost with the fire.
Though when watching antique roadshow,
it seems their experts seem to know a lot about all these esoteric "unknown" artists
from the previous centuries.