Correct spelling for the English word "coalsey" is [kˈə͡ʊlsɪ], [kˈəʊlsɪ], [k_ˈəʊ_l_s_ɪ] (IPA phonetic alphabet).
Fry of the coal-fish.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.