The "standard" Hiatt brand of handcuff seems to have been anything other than standard, as they had several sizes & multiple design variations, over the many many years of use.
The handcuff pouch design seems to be standard, with differences in dimension to suit the handcuffs.
The pouch seems to take inspiration from the Sam Browne revolver ammunition pouch in use by army officers.
The pouch makes for a nice addition to the duty belt for display or use at shows.
Front and rear view of a pouch, with handcuffs inside.