Hi All, Its worth noting that Randy Merris Merris has just done a survey of Tutors for the Concertina that has been published in the Journal of the Centre for Free Reed studies in New York. Quote (for Anglo):
'The 1846 tutor by Carlo Minasi (B49) and that from circa 1845 by Elias Howe, Jr. (B31) are the earliest British and American publications, respectively'

He also says about A.B Sedgewick:

Sedgwick (birth and death dates unknown) was one of the first music-hall concertinists and a member of the Blagrove-Case-Regondi-Sedgwick concertina quartet, founded in 1844. In 1850-1851, he emigrated to New York and became a well-known composer for the musical stage. He also performed, often with son Charles on baritone or bass concertina, in major theaters in New York....