In Germany the Mercator knife is colloquially known as "Kaiser-Wilhelm-Messer", in the US it is commonly referred to as "Black Cat Knife". The brass handle gives it a touch of noblesse.
Otter Messer - Brass Mercator Knife
Otter Mercator 10-736 RG R Large Brass Stainless Pocket clip
10701.RGR Folding knife OTTER Mercator series brass
Couteau Mercator Laiton Otter Messer
Mercator by Otter-Messer Traditional German Folding Pocket Knife
Bushcraft Canada - Mobile
OTTER-Messer Mercator Folding Knife 3.5 Stainless Blade Brushed
Mercator by Otter-Messer Traditional German Folding Pocket Knife
OTTER-Messer Small Mercator Brass Stainless OTT10701R
OTTER-Messer Large Mercator Folding Knife 3.5 Carbon Steel Blade
MERCATOR brass small, Carbon steel C75
Otter Mercator Lockback Folding Knife Brass (3.5 Satin) SS - Blade HQ
Bob's Cutlery
Brass Otter Mercators, locking and slipjoint knives
Otter-Messer Mercator Brass Large Carbon Steel Blade Lockback