My family have been making round knives & head knives for over 160 years
Leather workers knives
Round knives are the traditional saddlers knife, their curved shape providing greater manoeuvrability and cutting power. The larger sizes are for heavier work.
Head knife is suitable for more awkward work, where the round knife will not fit in. It is particularly suitable for cutting circles or tight curves. Some saddlers use head knife in preference to the round knife
Double head knife has its blade further from the handle than the round knife, giving it more manoeuvrability than the head knife.
Bridle cutters knife the long blade of the bridle cutters knife helps keep it straight when cutting cheeks,etc. The curved end gives it the cutting power.
French pattern knife is similar to the bridle cutters knife but smaller and has more edges.
Paring knife in the saddlery trade are used for cutting thread and paring hard materials down instead of spoiling a best round or head knife.
Fancy paring knife has the same uses as a paring knife but is heavier and can be used for skiving
Shoemaker’s knife the general purpose shoemaker’s knife is good for cutting thread, string, etc
Clicker knives are a shoemaker’s pattern makers tool and have a small, replaceable blade.
Just thought you might like to take a look
www.leather-tools.net