The Finch patent was in the following weeks batch, May 19, 1891, and had nothing to do with a double gun. The Torkelson patent shows a trigger guard opening semi-hammerless single barrel, but may apply to some small part associated with this gun.

I can't see a crude double like this being associated with the same Blake operation that made the beautifully finished bolt action rifles with the detachable rotary magazines in both standard and proprietary cartridges.