I've had a couple of great emails in from people with more information and photos. Firstly Per Finsted of the Danish Military History website http://www.chakoten.dk/ sent me a few photos.
The first of them shows an SMS Königsberg gun shortly after its capture. I had seen this photo before labelled in the Konigsberg book by Kevin Patience as the 8 Kibata gun. Bob Wagner initially pointed out some doubts about it being the 8 Kibata gun, namely that we believed the Kibata gun had no flange yet this one clearly has a flange and shield. Bob suggested that it may in fact be one of the two Belgian guns (6 Korogwe or 7 Tabora) which are known to have had both the barrel flange and small shield.

This better quality version of the photo seems to prove Bob right. It is from the Belgian Colonial Ministry and it claims the gun was captured at Korogwe (Kologwé), this is then gun 6 Korogwe and further confirms our theory-
6 Korogwe (Belgian Congo) Flange and Shield/Fixed Pivot/Dar Carriage
The Dar Es Salaam carriage can clearly be seen low slung below the wheel axle along with spoked wheels. Note the barrel and it's flange shield is mounted the correct way up here (with the flat side of the shield uppermost and yet when it was on display in either Stanleyville or Leopoldville (we're not sure which yet) the barrel was mounted upside down. The soldiers in the photograph are presumably then from the Belgian Force Publique (see http://www.rudi-geudens.be/html/force_publique.htm).
More to follow on guns 5 Mkuyuni and 8 Kibata ....
Cheers
Chris