from what I'm seeing, don't believe the red piece is the same as yours, but would like to have seen images from different angles to feel more positive. I'm having trouble understanding your picture of the 'pontil' - it looks odd to me. If possible, try taking again a few inches further away and, importantly, try to bounce the light off the base area - so that the 'pontil' mark is highlighted. In your picture, the extent of the grinding appears very small for the pontil scar - and I'm wondering if your piece is in fact a mechanically mould blown item. See the way that the interior of the base is 'humped' between the corners.
Pontil marks indicate the use of a pontil iron i.e. hand blown/made (not machine made) - and it was to the pontil iron that the piece is transferred after blowing. It is after removal from the 'pontil iron' that a roughness remains, and it is removal of this rough area that gives us the concave pontil mark. I'm not really seeing a circular depression on the base of yours. But maybe the picture is unclear - with clear glass, it can sometimes improve the definition of images if a black background is used.
