This dial for the 156 was made by German manufacturer Cador.
Rumour had it that it was a special edition for the Japanese market.
Yesterday I was browsing Google's image cache and found some pictures on koyanagi-tokai.com.
The model was named Sinn 156B.Sony.fc
They also had some nice shots of the 356 EuroFlieger
Here is another special edition of the 156 Mil
"Project Take Off - Sinn Special - Pacific Crossing of the Zero 1995"