Here is a pic of the bow mounted 7.62 SGMT on units 7,8,9, it is the little hole in the glacis, you can plug it up with a rubber bung to wade, was covered over when applique was added. Obviously cannot be aimed except steering the tank and advancing/retreating to change the point the bullets strike the ground.
http://data3.primeportal.net/tanks/y...155_of_195.jpg