This sale is for a near mint condition Mamiya Tripod Adapter Collar 3/8″ to 1/4″. Ideal replacement if you have lost yours or a previous owner has removed it!
This adapter converts the built-in 3/8″ tripod socket in the base of your Mamiya camera to the more commonly used 1/4″ fitting and includes the special locking screw that stops the adapter from coming back out by accident. This adapter is the longer M645/RB/RZ type, with minimal signs of use, with slot locking screw rather than cross-head. Please note that this adapter CANNOT be used on the 645 Super/Pro/ProTL cameras – it is only suitable for the original M645 and RB67 / RZ67 cameras.
Try finding another one – very hard to find.