Name the bottom bracket

Yes I think your right with TNT! It's got the same large holes in it. Out of interest if you take the crank covers off are the bolts TNT?
 
The TNT Ultimate, could well be. Not sure if they switched to that design before or after the Ultimate split.. (94ish). I know the other design is the same but for use with a splined tool.

Someone who knows them may know.

Google may bring more up. They where quite a few design of TNT made and for people they made them for.
 
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