The s/n tag on mine says it's a "BS-175/Dual Twin", but it seems to have a lot of the parts from an HS. It has mid-pipes, reinforced handle bars, and what appear to be the original Bridgestone 3" tires. On the other hand, it doesn't have a skidplate or the stingers on the exhaust.
Could anyone offer some insight in identifying which model this is? Were the HS bikes identified as such on the s/n tag?