Necchi BU Mira
Pictured above is our Necchi BU Mira. It is a metal machine and heavy. Nevertheless, it is a fun machine to use. The Wonder Wheel is a real "vision" to watch while in operation.
Mira is a model as is Nora or Nova or Julia. The designation BF means straight stitch, BU means zz in addition. If you want zz you have many model choices with BU after their name. Mira, Nova, Nora are class 15 bobbin machines. (This from Necchi Yahoo Group.)
We don't have the machine dated as yet, but judging from how primitive the Wonder Wheel is, we suspect it was among the first such attempt at fancy stitches.