My "new" old Kodak 2D 5x7 I picked up for $50! It;'s in very good shape for it's age. Came with 6 film holders and a Wollensak Velostigmat series 2 f/4.5 12inch lens. Also included is a Bausch & Lomb 5x8 Tessar Ic. Oh a wooden Agfa tripod was included. The bellows look like new.
Now to find some expired 5x7 B&W film to test with.
Test with paper! It'll work great. I did it for yers with just this rig in Monterey CA. What great fun. Cut your Dekto; a bit and it'll work fin. Shoot the paper about ISO 003 for starters and have some fun, Pal... good luck and happy shooting... I drove Cole Weston crazy doing this in Monterey