Haven’t seen one of those enduros for a while and it appears to have a mono shock swing arm..I use to race Susuki 250s in Enduro in Nothern CA back in the day..
I have one in my garage, it's an '82 that I bought new and totes "ALMOST" 5000 miles on it.
It's my baby, however I spend more time focused on work and family than on riding.
Got her fired up last month and so far put 5 miles on her this year. I eked 45 miles out of her last summer though...