No, posting a picture here wouln't be acceptable. You could send it to
those who ask, though. From your description, it sounds like the loop
of insulated wire between the two pins couples to the stub--the
1/4-wave bottom of the antenna. I guess that stub is over 400mm long,
so your wire only goes up a fraction of that distance. Someone may
have engineered it, or they may have determined it empiracally, but it
sounds to me like quite an acceptable way to couple to the antenna.
And that seems like the most likely reason it's there, so that's where
I'd connect the coax. I'd guess that there isn't much difference
between the two possible polarities of connecting the coax to those
pins.

Cheers,
Tom