I am making a list of ProtectoPlates that I currently have in my possession.
124378L300340
123378L325019
124378L327551
124378N302149
124378N321064
124378N332163
123378N345561
124378N350724
124378N359846
123378N360523
124378N363480
124378N372488
124378N375619
123678N404729
124378N404816
124378N430731
124378N439754 (book punched) or 124378N439756 (stamped plate) they don't match. Plate is probably correct.
124678N444738
124378N459001
124378N467998
124378N480978