Zeiss-Ikon Nettar 517/16 brand_Arca Swiss and this optical system is

and this optical system is excellent

and the included (and non-removable) ball head is a quality piece

6 DG HSM lens is a good quality full-frame ultrawide lens for Canon EF mount SLR cameras

This came out in 1959 and cost more than 5 grand in 2021 dollars

Shutter and meter are both accurate

Zeiss-Ikon Nettar 517/16 brand_Arca Swiss and this optical system isThe Zeiss Ikon 517 16 is a compact folding camera that shoots 6x6cm exposures on 120 rollfilm. It's equipped with a scale focusing 75mm f4. 5 Novar Anastigmat lens in a four speed Pronto shutter. This Nettar is in excellent condition, with minor cosmetic wear. Lens has only slight dust, bellows are good, and the shutter works well. About as close to pocketable as medium format gets. Includes leather case.