http://www.littlegun.info/arme%20allemande/artisan%20c%20d/a%20collath%20w%20%20gb.htm

Those safeties look like a hold over from the percussion era & I wonder if both tubes were designed to fire cylindrical projectiles? I'll have to dig a bit to find a double with similar safeties to compare.

Kind Regards,

Raimey
rse