I believe that is the model above the Hoo Koo E Koo or HK II. What do you mean by an expander on the stem? does it have a 1 1/4" HS?
I am not sure about the curved DT though.
__________________
“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