I have almost the same mystery. I have an Electro Grand machine with missing disks. I'm thinking it may have been made by Brother. It has a BOM select but maybe it is a D... With out the disks I'm not sure how to figure all of it out either. Button hole, darn, manual? Button hole, disk, manual? Mine has no built in button hole stuff behind that BOM selection... Maybe it is some other language? I think I set that one on a shelf somewhere and forgot about it while it waits for some disks. I'm thinking it works ok otherwise.