Bushnell 3-9 .... how many models?

[woof]

I bought a rifle with a Bushnell 3-9 scope that has no markings. How can I determine (since I'm not familiar with Bushnell) what scope it is? Thanks!

 

[heeler]

Pictures for sure will (maybe) help.
Bushnell has been cranking out 3x9 scopes for a loooooong time in one fashion or another.
Everything from top shelf quality to Wal-Mart blister pack quantity.