Looks like a Cdn3. The rear axle is the latest type. The rest of the photos don't show the details needed to determine. Take a shot of the insides of the frame just over the rear springs at the front hangers. You can also take a shot of the front brake backing plates.
Axles could be swapped between the years, but it wasn't quite that easy. The rear axle of a Cdn3 was a larger diameter, so you also had to replace the U bolts and the plates, so with that in mind, your is likely a Cdn3. The frame photo will tell for sure.
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