dfk41 - you are right, I understand. But even the 58mm baskets have changed considerably with the 3rd wave coffee, light roasted, freshly roasted, bla bla bla. The walls are now straight (they were tapered if you remember), have a bigger perforated area and can be bought in all sorts of different sizes. If you have an old el cheapo 58mm basket lying around, like, from 15, 20 years ago, compare it to an IMS competition or VST. Take the LSM baskets which came with the machine you have. Can you fit 14g in them and not think “that’s not enough coffee in there….” I bet you can’t, not these days.
As for the E61… no idea. Faema invented, patented, became very popular. That’s all I know.