The word "class" itself is somehow interesting, where does that prefix with "industrial sewing machine" come from ?? Many change the serial number with the class of the machine, it has nothing to do with each other, although the serial number of some models can determine which class of machine it is, for example, older Singer sewing machines.
Class is a foreign word, but it has become a standard in our country, it could be "roughly" translated as a "category" of sewing machines. It originates from the German word "Klasse nähmaschinen" or the English "class sewing machines".
Mnogi mijenjaju serijski broj sa klasom mašine, to nema veze jedno s drugim, mada se po serijskom broju kod nekih modela može odrediti o kojoj je klasi mašine riječ, recimo kod starijih Singer šivaćih mašina. Klasa je strana riječ ali je se kod nas ustalila kao neki standard, ona bi se mogla "grubo"prevesti kao "kategorija" šivaće mašine. Porijeklo vodi od njemačke riječi "Klasse nähmaschinen" ili engleski "class sewing machines".