Very limited production from 150 years ago at a company that went out of business very quickly. That will b very difficult to find. They abandoned the DA design b/c of problems.
If you find the drawings plase post them here or contact me via PM for my e-mail. Best bet may be to find an actual example and try to get it 3D scanned.
hello , hello , please, somebody know the revolver Kerrdouble action with hammer security 
?