The spelling of the word "Halser" may seem confusing at first, but it follows the rules of English phonetics. The word is pronounced as /ˈhɔːlsər/, with the stressed vowel being "o" as in "hot". The "a" in "Halser" is pronounced as "ɔ" as in "caught". The final "er" is pronounced as "ər" as in "butter". This word is not commonly used in everyday English, but its correct spelling and pronunciation can be useful for those studying the language.
See Hawser.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.