This Sinar / Horseman 140x140mm recessed 23mm lens board adapter accepts 4x5 Linhof Technika-type lens boards. There are a couple of light scuffs and a small patch of finish loss on its interior.
Wista
Toyo-View
Schneider
Linhof
Toyo
Sinar
Schneider Kreuznach
Linhof