It's not pre-industrial, but I think a machinist would be very, very high up on the most valuable trade ranking.
Throw in a good machinist with some sand casting, and you can re-create cottage level industrial infrastructure from scratch.
Being able to make guns, mortars, long stroke engines, or even just basic things like screws, pumps, and tools would be...very useful.
Likewise, a bucket chemist would be useful as well. Someone that knows how to leach nitrates from a titer bed to make gunpowder/explosives.
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