"Croft" Darby - Seeking Information

I have recently acquired a very nice set of darby style handcuffs.
The key is not original but is really well made and operated the cuffs flawlessly.
There are only 2 markings on this restraint, the number 15 and the word Croft.
Does anyone have any information on the potential for a "Croft" manufacturer? The stamps used appear to be the same font style as Froggatt.

I’ve been told they are most likely made by Hiatt. Croft was most likely just a distributor. That’s the third one I’ve seen though. Ron J

The end caps are smoothed out and don't feel like HIATT, feels more like R.C.S if I am honest....

Just going by what I was told buddy, I honestly have no clue. Ron J