This is really nit-picking but we would not call that "capsule" shape braze-on that Allegro used for serial numbers a "lozenge" since that's technically a diamond (or rhombus) shape. I understand the idea that it's also what we call cough drops since the very first of those were cut in a diamond shape and this panel could also look like a (more modern) cough drop or other medicine...like a capsule.

OK my nit-picking is done so let me also say it's great to see some progress with getting a handle on Allegro serial numbers and that Michael (Amberg) has complied one (care to share a link to that, Amberg?)