The ThC logo is the older logo of Thaler Corp, and my Thaler datasheet is Rev D 2001. I have posted it below.
The USA marking and omitting the "S" off the end is in line with the way Thaler do it. I thought I had purchased mine in the early 2000s, but it looks like I got it in 2007, so I have a late model with the newer TC logo.
The case style is unusual, so there may not be any other reference ICs in an identical case. Mine has no visible ceramic cement between the upper and lower half of the case, but that many be a refinement after 6 years. The metal contact construction in this 2001 IC are slightly different to my 2007 IC.
Why has he got a photo of a more accurate "A" model when he is offering a "K" model? I do not know the answer to that question, except for the fact that to quote the part as a VRE305KS, he is not reading it off a chip - that may be the code of a tube, box, bag, or somewhere else. The IC will have the part number VRE305K.
Given the market price, it is possible that someone has got a REF02A chip (or similar) and put it in the SOP-8 ceramic package to make a fake. It would work in the same circuit, except the initial accuracy would be over 10 times worse, and the long term drift over 20 times worse. In the photo, the IC is sitting on a PCB, and may be soldered onto the PCB. It is odd.
I did an image search on Google, and no match for that photo was found, so the seller may have actually taken the photo.