Yes and quite  common.  Often called a Egyptian or Guard gun. Made by Greener since the mid 1920's, later by Webley when they acquired the rights. I am too lazy to turn around and look it up in my library right now, but discontinued mid 70's or 80's.

It has three prong firing pin.  The cartridge has an annular ring in the base.  Two of the prongs go in this ring allowing the center pin to strike the primer.  This  prevents the use of standard shotgun shells in the gun.  The cartridge looks like a bottle neck 12 gauge shell. The front half of the shell is 14 gauge dimensions, the back half is 12 gauge.  This makes this gun difficult to use if stolen.

It would seem to be real simple to disassemble the gun and remove the two safety prongs, but Greener added one more feature.  The seating joint for the knuckle in the back of the action is machined extra deep.  That deep knuckle seat makes this gun a booger-bear to reassemble.  I made special lever to seat the block and it was still difficult to install the block.  I tried to avoid at all cost taking these guns apart.  It is not easy to assemble by hand alone-but can be done-with brute force, old worn parts and bit of luck.