eBay seller edgartech. They said they heard it could be a TI SN74AUC2G125 (most likely based on this http://www.digikey.com/product-detail/en/SN74AUC2G125YZPR/296-16800-1-ND/634960). This looks more like a power diode but I'm marking it TI since I have nothing better and it does say TI on the label.

Seller description:

SILICON WAFER - 4 Inch (100 mm) -- *MYSTERY* - ??? TI SN74AUC2G125 ??? - Qty:1

Mystery Texas Instruments 4" Wafer per photos

We have been told this is (but not guaranteed) in some fashion:
- TI SN74AUC2G125YZPR 296-16800-1-ND Tri-State Dual Bus Buffer Gate

Some web info if correct IC...
  - www.ti.com/product/sn74auc2g125?CMP=AFC-conv_SF_SEP PDF
  - www.ti.com/lit/ds/symlink/sn74auc2g125.pdf

In vacuum/heat-sealed packaging per photos 

Markings

  SLICE No. 32
  WAFER TYPE TU155YQ
  LOT NUMBER 0185737
  TI Part No 16800-1
  GOOD QUANTITY 1205
  UK ORIGIN