Greetings people!

I need help )))

I have the 5x7 camera from my great grandfather, and I'm curious what model is it exactly, because there is no labels on it, except on the lens but i know that this lens not original, "original" lens was zeiss and it was stolen many many years ago.

Please, may be some one could recognize my camera.

And also can anyone recommend my some good and sharp lens which I can get for this camera on ebay (for ex.)

Labels on lens which i have:
Doppel Anastigmat koelar f:6.8 180mm K. Lorenz & Co.
with D.R.P. Compound D.R.G.M. Shutter

Thank you.