It's a dry plate bookform holder, with what I would guess is a 18x24cm insert inside a 24x30cm insert in the 30x40cm holder.

The camera itself is a "generic Reisekamera", or tailboard focussing portable German plate camera. Without a name plate it's impossible to tell who made it; there were literally hundreds of makers - not all of them in what is currently Germany.

Could have been made at any time up to about 1935 I guess, late rather than earlier.