I think the exhaust was only in the early years on the left side. After one or two years the exhaust was on the right side. Maybe the moped on your foto is not original
I'm not an expert in Quickly-history.
I can recommend the 2-gear models for someone who want to start his Quickly-career
The 3-gear gearbox is difficult to adjust and the parts are more expensive than the 2-gear parts.
Let us know if you buy a Quickly!
There have to be more than one person with a Quickly in an mopeforum about east-german mopeds and motorcycles!