And the advantage of a class 15 bobbin machine is that it takes longer to run out of bobbin thread:-) Also, class 15 bobbins are widely available. Thanks for the explanation, Cari.
looking at the picture, I probably would have bought it because a) the price point is right, b) What a beautiful color! c) the electrical cords are in great shape, from what I can see, and d) the chrome looks shiny and the paint unchipped which is a possible indicator that the innards are unrusted. Actually, those points should be in reverse order.
Besides, you hardly have ANY machines in the small collection you named ��!