Just to clairify, the dot patterns you are all discussing are called CMYK Halftone. You will see them on both digitally printed items as well as silkscreened, but the only difference is resolution - Stern has (had rather) notoriously crappy resolution because the mesh size they used was very big, whereas Bally Williams games used a much smaller mesh size but you can still see the dot pattern when you look closely, and modern printers are able to cram obscene amounts of dots into a square inch.
The CMYK (Cyan, Magenta, Yellow and Key - meaning black) process is simply 4 different coloured inks stacked on top of each other at different angles. Like so:
Depending on how far away you are, you will see hexagonal patterns start to form and then going further back eventually you see the full image clearly:
The above image is from the Monopoly decals I restored for Retro Refurbs, they were completely drawn from scratch and the CMYK Halftone pattern had to be manually created. This is then digitally printed.
But even screen printed stuff made in the 90's was able to get very fine dot mesh, like this Roadshow translite which shows the same dot pattern:
Regardless, whether decals are printed digitally or by screen it makes no difference as both can achieve the same effect. It's hard to say if that ToM has been redecalled or original without inspecting it closely, but either way who really cares? If the game looks nice and plays well then just enjoy some pinball... and beer!