I happen to have 4”x4” section of the Lusitania hull plating with a rivet in the center. Obtained on a saturation dive we did in the 80’s looking for artwork etc. Always wondered what it would bring.
S/
I would imagine the first difficulty would be establishing the piece’s provenance. But assuming that could be done, I would think your potential market would be museums or the rare collector, which would limit the demand.
On the other hand, the supply is even more limited, so you might fetch a decent price.
I read once that in 1982 salvage divers managed to detach three of Lusitania’s four propellers. IIRC two of them are on public display.
The name “Lusitania” was still legible on the wreck at that time. The artist who specializes in painting depictions of sunken ships showed the Lusitania’s hull with hundreds of fouled fishing nets & glass floats waving eerily in the deep.