What diff do I have?

Hi all. I bought a diff for my Eunos Roadster and can’t identify it. It was sold to me as a T1 Torsen which I don’t believe it is as it has what I think are clutch plates. It came with split shafts. The only identification marks I can see is 1245 stamped on the crown wheel and it’s a 4.1:1 ratio.

TIA