This sale is for a really excellent condition Mamiya 645 Pro wrist strap, suitable for use on the Mamiya 645 Super, Pro and ProTL cameras – and the M645 series if you really want to.
This strap was originally sold with and designed to be used with a motor drive grip – and they certainly work extremely well in combination with a motor drive – I use one myself. This example has really minimal signs of use, just slight rub marks on the connecting lug, but there is some ageing on the strap eyelets (see photo 2).