There is not much information available about these early models; according to Lambrou there were different variants: the number 575 with cylindrical cap, the number 576 with conical cap and an ''[[overfeed]]'' feeder, the number 577 with conical cap. | There is not much information available about these early models; according to Lambrou there were different variants: the number 575 with cylindrical cap, the number 576 with conical cap and an ''[[overfeed]]'' feeder, the number 577 with conical cap. |