MRC:
An indication of the precious material contained in the item,and the amount per a measurement scale.PMWT
Precious Material And Weight:
0.040 silver grains, troy
MRC:
A feature of the item of supply which must be specifically recorded when the reference number covers a range of items.ZZZY
Reference Number Differentiating Characteristics:
As differentiated by the width, length, winding device type, trade designation, perforation location, high speed camera perforation, and perforation identification designator