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Thieves have stolen a brass plaque commemorating soldiers who died in the First World War.
Another plaque to honour Viscount Northcliffe was ripped off the wall of offices at The White House, Clifton Marine Parade, Gravesend, but nobody is sure when.
One plaque recognised employees of the Imperial Paper Mills, who died in the war, and the other marked the death of newspaper baron Alfred Harmsworth who held the title of Viscount Northcliffe.
Clifton Marine Parade is next to an industrial site near the River Thames, once home to a printing press and a paper mill.
The Harmsworth Press was owned by Viscount Northcliffe, printing comics and other publications.
Paul Dixon realised the plaques were missing while on his way to work and took to Facebook to vent his frustration.
He believes the brass plaques might have been stolen for scrap and asked anyone from local scrap businesses to come forward.
He said: "Let's shame these people, it's such disrespect."
A Kent Police spokesman said officers are investigating.