What large spline BB tools do you have in your kit? Odds are its one of them. You could always schlepp the bike down to you LBS or CoOp and ask them for the size or even to pop it out.
I believe some knockoff/clones used the shimano pattern for the splines.
__________________
“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk