Looking for the patent for this prison lock

[Carlking]

It measures 6 x 9 x 1.375 inches, and weighs 9 lbs. The key was hand wrought and pretty well made.

My first guess is; it is Pauly or L.M. Ham, since they both used locks with drilled keys. If it was used by one of these jail builders; they could have purchased them from a lock manufacturer, even a foreign maker like Chubb. I know some early safe manufacturers bought locks from English lock makers.

I haven't found any any lock patents for this lock attributed to these companies, or the people connected to them.

The keys shown are keys in my collection that bear a resemblance to the key that fits the lock.

Thanks for your help.