Thank you - this should help.I don't know the model/designation , I need to find out, but it was developed by CIS in the 80s with foriegn assistance and tungsten penetrator is imported.
Here an old picture of a cut out of that rd:
http://img141.imageshack.us/img141/7669/75mmapfsdseu9.jpg
and here another during AOH (taken by goat89 and posted in MP.net forum)
http://i166.photobucket.com/albums/u106/goat89/SDViewer0015a.jpg