It can be printed with offset or rotogravure. Offset has no dot depth and printing surface is flat but rotogravure is like carbon print and every dot have a different depth and width. If your dots are square , it could be offset but if they are elliptical they are rotogravure or tiffdruck in german . If anyone interested in the beauty of screening interplay , find national geographic magazine from 86 to 89. They are all ektachrome and kodachrome shots and dai nippon drum scanner work. The other thing for rotogravure , the cylinders are copper and they dont wear with 1 million of prints. Offset always change the print quality with short run because cylinders are aluminum.
All the food packaging to wall papers are still done with rotogravure.
Offset ink is in tonal control during print with water additive. Water lower the ink quality and rotogravure uses alcohol as additive.
Alcohol evaporates very fast and leave a clearer dot.
At 70s or that era , tiffdruck done with coating copper with gelatin and uv shot with film. It leaves a three dimensional relief on gelatin and acid react to thickness of gelatin. Its a metal carbon print with screening.
I have a article at articles section.
The tonal depth of rotogravure and ink density is times more than offset.
Last gelatin rotogravure is at india AFAIK. Now they dont use copper plate and directly engrave on cylinder with laser or hammer and it increases the prices. Rotogravure technique is the pinacle of printing and ink research is massive.
These guys dont use film separations also and you dont need a laser on film screener. If you find a loupe and dive in to national geographic 86-89 issues , its better than sex.