Help with Assist variants identification

[Spydersharp]

Hello!!
Will someone help me to identify these Assist variants? I was offered the following:

C79 PSBK 2

C79 PSBK

C79 PS2

Which are the differences of these sub models?

Thank you in advance for your assistance!! Best regards, Abel

 

[gaj999]

The C79PSBK and C79PSBK2 are the Assist I and Assist II respectively. I'm also curious about the C79PS2. My guess is that it's a version of the Assist II but that's all it is - a guess. Anybody know for sure?

Gordon