The only two flat tip transitions on TIG are v1 which is notable for the thin protrusion from the tip (almost like a 2nd tip if you like) and v2 which is shown with letters on the hilt. It certainly is not v1 as it does not have the small protrusion and I have had one of these variants in the past and know the back end is much thicker; and I have a v2 with letters on it which has a completely different back end to this one as well. However, I realise that TIG is not always 100% up to date, and also does not show pictures of the back end, so was just looking for up people's views on it before talking to this guy again.
If I had to hazard a guess I would say it was repro v3, although in the poor lighting I have I can not tell if it has a texture to it as TIG describes. I have seen a few of what I believe are these 90s repros and have an almost identical suspect blue Ben one which I have quarantined in my repro bag.