http://www.littlegun.be/arme%20belge/artisans%20identifies%20l/a%20leclercq%20leon%20gb.htm

Leon LeClercq was an armour who was active from 1908-1940. Over the years he had shops in Belgium, Spain and France. I can find no record of him holding a patent of any type for sporting guns. I believe "LeClercq Systeme" may have been just good marketing, though I could be wrong.

The 1st .410 gun we have evidence of was proofed circa 1870's in London. It remained largely a British cartridge with American's preferring the 44-shot, aka 44XL, a 44-40 loaded with shot. On the continent they preferred a variety of other rounds. Around 1915 the 410 appeared here. It became popular here and in Europe in the 1920's.

These folding guns became very popular because of the advent of the bicycle and eventually the car. Because of this, most have seen hard use. They were marketed as ladies guns, boys guns, taxidermists gun, bicycle guns, etc.

Hope you enjoy the guns.

Pete

http://www.damascus-barrels.com/Movie.html