Raimey,

1 piece double gun - 'strip' barrels (as explained by Xausa above? not sure)
with single hook system & all loading equipment Florin 48

the same with simple (single?) key FL 48 - 54

the same - system Lejeune - 'turning barrel' (opening?) with 'strip' barrels FL 54 - FL 60

the same (with) double-key(?)wire barrels FL 65 - FL 150

the same - system Godin - with wire barrels FL 60 - FL 150


rgds
Gunter