Thomas was a prominent clock and watchmaker in Arundel and is the only Walder so far to have the benefit of a blue plaque in the High Street. His shop has been replaced by a later building but his original town clock is still there, albeit with a new face.
Thomas left a detailed notebook which is now in Arundel museum. The museum has also produced a pamphlet on Thomas which includes pictures of his notebook and some of his clocks. I am not sure at this point if it is still available.
The 1851 census records Thomas as a retired watchmaker, widower, age 84, living in Tarrant Street, Arundel.