UPDATE: **SOLD** Was on eBay.
It’s probably had some side panel work done.
“Fun Jeep to drive, clear title, 4 wheel drive with high and low range transmission. Drive on or off road. Duallys look like is a factory option. They add roll over stability on slopes and hills, and less rutting in mud. Have owned for 25 years, I do think the miles listed is likely correct as I bought it from a golf course. Vehicle does wander some at higher speeds on road, and wipers don’t work. May have minor amount of additional miles (less than 100) when sold. NO RESERVE”
The duals are done with an adapter otherwise you would see the hub for a full floating axle.
That looks like a different rear axle.. 6 lug bolt pattern?
Here’s an example of an FC Dually with the 6 lugs: http://www.ewillys.com/2016/06/24/1962-fc-170-drw-utah-40000/
Somewhere in the past postings there is a picture of the adapter that bolts onto the 5 lug drum to change it to the 6 lug budd wheel but I haven’t found it yet