The class 15 bobbins have a protrusion with a notch in it. You can see that the bobbins in the middle and on the left are flat on the top with nothing that could catch the thread that moves over that area when creating a stitch. The only issue I've noticed is that, rarely, the thread will not pass correctly over the bobbin on a stitch. These bobbins are the same size as Elna bobbins, but they do not have the groove running down the inside. On the right is your typical class 15 bobbin. It's not a big deal, and the bobbins work fine in the machine. ![]() The groove in these new bobbins is not deep enough, meaning I cannot fit them on the bobbin winder. I bought these bobbins on ebay from a seller who claims they will fit Supermatics, but that's not entirely true. ![]() You can see a modern reproduction of this type of bobbin in the middle pictures. Later Supermatics came with a slightly different version of this bobbin, where only one side had holes and the other side was solid. Inside the hole, there is a groove that runs the whole length so that the bobbin can fit on the bobbin winder. It has holes on both sides and a smooth top. The first, on the left, is the bobbin that came with the machine originally. In the pictures you can see three bobbins.
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