It could be a wet sheet transfer, but it's very solid if it is.
(The technical term is an "offset transfer" but wet sheet transfer is close enough and has become the standard term)
More likely it's an impression cylinder transfer. Those are usually very strong and detailed.
The plate or stone is dampened, inked, then prints to an offset blanket, a rubber sheet. That then prints to the paper or cardboard. To give it something to press against, there's a smooth metal cylinder - The impression cylinder.
If a sheet doesn't feed, the blanket prints to the impression cylinder. Then when the next sheet feeds, both the blanket and the impression cylinder print to the cardboard, except the impression cylinder prints reversed on the opposite side.
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