Field of Chemistry: His primary work seems to be in the area of applied chemistry, particularly focused on the hat making industry. His book, "The Chemistry of Hat Manufacturing" details the chemical processes involved in hat creation [Project Gutenberg].
Possible Accolades: He might have held the title of Fellow of the Chemical Society (F.C.S.) and Fellow of the Institute of Chemistry (F.I.C.) based on the title page of his book [Project Gutenberg].
Possible Affiliation: Watson Smith might have been a lecturer in Chemical Technology at the Owens College, Manchester (now part of The University of Manchester) and Victoria University [Project Gutenberg].
Additional Points:
There's also a Watson Smith who authored books on Southwestern archaeology, but their areas of expertise seem distinct [Goodreads].
Due to the lack of extensive information online, it's difficult to ascertain his exact dates of birth and death or the full scope of his contributions to chemistry.