Another two cents on the concertina issue. . . I've been reading lots of sailor's journals and logbooks for my dissertation research and have found numerous references to sailors buying concertinas from German traders in the Pacific, circa 1850's. Apparently it was not uncommon for Bremen whaling ships to sail to the Pacific with a cargo of musical instruments: flutes, ocarinas, harmonicas, fiddles, concertinas, etc. . ., and sell them to other ships and people ashore as they whaled their way around Oceania.
Rev