MRC:
The lettering or design on the item,or that is the item.AYBM
Inscription:
Telescope, panoramic, xm137, serial no.---, 19200-11741101, ---, ---, ---, us 1st side
MRC:
The specification,standard,or manufacturers reference,and the classification designation,such as class,condition,temper,and the like,that identifies the material.MDCL
Material Specification:
Qq-a-250/2, alloy 3003, h14 federal specification 1st material response or qq-a-250/2, alloy 3003, h24 federal specification 2nd material response