I've posted the pictures on another BP site that is usually able to identify oddball revolvers. This is the best one of the members could do.
"Hmmmm.............. The "ELG" is a Belgian proofmark. If there is a crown over it then its before 1895, no crown means after.
It looks like some version of one of the the Belgian "patent infringment revolvers" There were literally thousands of different models, all copied partly or completley from an existing patented design. Literally every bycycle shop was cranking out some kind of pistol, all copied from existing designs that were sometimes mixed & matched to try & claim an "original design" but all they did was steal several ideas & combine them. The side hammer could have come from a beaumont, or Beaumont-Addams, the cylinder pin from a Colt Root & the loading lever from something else entirely. "