German Cross by Steinhauer & Luck?

[D Funk]

a

This piece is in stunning condition!

[Matthieu]

I would agree with Rüdiger on this one. The setup / hardware is similar to the one found on early 1957 issue S&L.
I've taken the liberty to use some pix from Weitze, who has such DKiG on sale.
The setup looks similar to the one above with difference of the swaz replaced by the EK and lack of "4" marking.