Originally Posted by
unworthy1
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. ...
that bothered me as well but I didn't want to be "that guy"! I've also seen the thing called a cartouche, for what that's worth.
I imagine they could easily mass produce a few thousand serial number plaques and be sure of legible non-repeating numbers, ready to be brazed on.