I was a little inaccurate with the question, really sorry.
I know the following things: it a 2way plated LSD in a R200 S13 casing. Ratio: 48:11, so 4,36. But noone can tell me what make the diff is. If I ever need a rebuild I should know the manufacturer.
The previous owner claims it arrived in a Nismo box with Nismo oil when it was brand new about 3 years ago. But to be honest it doesn't look anything like Nismos.
Yes, the photos are quite bad, sadly my camera died and my phone is horrible if it comes to photos. :S I only would like to know the brand of the diff.
According to google images it's not ATS, Balltec, Nismo, Kaaz, Cusco, Tomei. There aren't others I could think of.
Thanks a lot!
Regards
István