Welcome to the forum James.
It's a Flobert type, for indoor target practice with low powered "BB Cap" ammo that uses only the primer to drive the bullet. The only "breech block" is the massive hammer that directly strikes the cartridge. Describe how it malfunctions, as the mechanism is simple and the trigger is obviously there. Even if repaired, do NOT fire it with regular .22 ammo.
Here's a bit about the inventor, but if marked only with the Liege proofmark, yours is one of the multitude of copies made in Belgium: http://www.littlegun.info/arme%20fra...obert%20gb.htm