Ponton estate conversions?

[W124Bob]

Anyone help with identifying who did this conversion?
http://www.flickr.com/photos/28630680@N06/46800898...
I thought it might be Crayford but they didn't start conversions until 1965 and their first was not a Ponton.

[Catchpole]

I think that's a Fintail (Heckflosse) estate, not a Ponton. The Fintail estate conversions were done in Belgium by IMA Zaventum and known as the Universal. That doesn't look like a Universal, as the ones I've seen haven't had that peculiar lip in the roofline. There is actually a picture of a Ponton estate on Flikr - its in the photostream of MR38 - sorry I havent worked out how to do a link yet. Another one, said to be by Karosserie Binz (?) went over the block at Bonhams in April of this year. I have to confess that I didnt know that there was a Ponton estate till I found the picture on Flikr. Anyone know anything about them?