Has the top marking for WGI210IT S LJXT always been WGI120IT? According to the Intel Ethernet Controller I210 Specification Update Revision 1.6, the top marking for the Industrial Temperature Copper version of the I210 should be WGI210IT (on page 5 of the Specification Update).
I have some parts that I received from a reputable distributor sold under the part number WGI210IT S LJXT but the actual ICs are marked WGI210AT. It seems that these are the incorrect part but I'm trying to verify that.
Never mind, I just found this additional information in the same documentation.
That small "I" in the bottom right corner denotes Industrial temperature.
I'm not sure why Intel's specification has a table that shows misleading top markings on page 5.