Sure grip?

So I have done some research on mopar rearend info, I know the different types and such but I have never seen a clutch type in person
(kind of a newbie only 21) so here is a dumb question I saw this possible Sure grip on Craigslist but don't want to get it if it's open I only
got a picture of one side so if you guys could let me know if it's a sure grip or open it would be much appreciated.

21 eh? Don't worry about asking questions, you have another 50 years to figure it all out.