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Mercator K55K Folding Pocket Knife - Reed Green

Otter Messer

Mercator K55K Folding Pocket Knife - Reed Green


Brand: Otter Messer
Weight: 76 g         92 reviews
The Mercator K55K is a traditional folding pocket-knife of historic origin, first produced in the iconic knife-making town of Solingen, Germany in 1867. Little has changed from the original design, yet despite being in production now for over 140 years, the K55K is surprisingly modern even by today's standards, exceeding the quality and design of many newer knives. Perfect as a working tool for stalkers and bushcrafters alike, it also makes an ideal gift for collectors of historic knives.

Here at Woodlore we are very excited to become a small part of the K55K's history, by way of being the only UK stockists of this legendary knife. In recognition of our belief in this product, we have added our own touch to the K55K by having an exclusive version produced just for us; this 'Woodlore model' features a custom handle in Reed Green, with the classic K55K logo engraved in black.

The K55K first gained popularity in the United States following World War II, when returning servicemen brought Mercator knives home from Germany. Since then, the K55K's reputation has grown and grown, with outdoorsmen all over the world discovering its compact size, light weight (only 76 g) and premium build quality. The locking blade is made from Stainless Steel, resulting in a knife that is built to last and easy to sharpen. Ray Mears recommends the RWS Quick Sharp as the perfect sharpener for the K55K.

The knife's unique name originates from the company's founder, a Mr. Kauffmann. Mercator is the Latin translation of 'trader', which in turn is the English meaning of Kauffmann. The model name, K55K, comprises of the founder's initial, followed by the street number of the company's original address – Hochstrasse 55. The second 'K' is the initial of the German word for cat – katze - and the famous 'leaping cat' logo can be found engraved on the side of the handle. Indeed, for many years the knife was simply known as the 'Black Cat', or 'Jumping Cat' by American soldiers.

All folding knives should always be used with caution.

  • Handle colour: Reed Green
  • Exclusive to Woodlore
  • Blade material: Stainless Steel
  • Blade length: 9 cm
  • Handle length: 11 cm
  • Locks in open position
  • Lock release lever
  • 'Leaping Cat' and K55K logos engraved on handle
  • Nail nick on blade
  • Lanyard attachment
  • Weight: 76 g

  Under UK law, this item can only be sold to persons over 18 years of age. Woodlore will need to verify your age before your order is dispatched and a check will also be carried out upon delivery. This item cannot be delivered to a locker.


  Delivery in 1-2 days within the United Kingdom
  UK Orders placed before 2PM GMT will be dispatched the same working day
  Overseas delivery times will vary depending on the destination

Please note that our offices are closed at weekends, so any orders placed after 2PM GMT on a Friday will not be dispatched until the following Monday.

Orders with a total value over £300.00 will be dispatched free via a next day delivery service within the UK at no extra cost.

Please note that in some instances, orders for heavy items may take an extra day to arrive.

  Overseas deliveries
For overseas deliveries, please refer to the following estimated delivery times:

  • Europe: 3 - 5 working days
  • Rest of the world: 5 - 7 working days


A full refund or exchange will be given provided that the items have not been worn or used, and are returned to us within 30 days of purchase, together with all relative labels and packaging. You are responsible for the cost of returning items.

Please ensure that you include a copy of your invoice, along with an explanation of why you have returned your goods. If you wish to return your goods for any reason, please do so to the following address:

Woodlore Limited
PO Box 3
East Sussex
TN19 7ZE
United Kingdom

Product Reviews

Mercator K55K Folding Pocket Knife - Reed Green is rated 5/5 based on 92 customer reviews.

All of our product reviews are from customers with verified purchases.

Overall Rating:


  1 of 92

  Great little folder! Highly impressed with this K55K in the rather rare and attractive 'reed green' colour way. A very slim but sturdy knife with a decent length blade for any camp tasks. Lightweight too. One slightly sharp 90 degree corner where the blade folds, making me slightly wary for my trouser pockets. I see this more of a go to jacket pocket knife. So slim and low profile that you'd forget it was there. A pleasure to own one of these classic folders that have stood the test of time for over 100 years. Great knife for the price as well - top stuff Woodlore. I can see this knife lasting me a long time. Incredibly swift despatch & delivery from the Woodlore team once again. Thanks a lot.  

  Charles Hunt
3rd May, 2024

Rated: 5/5

  2 of 92

  Fast delivery, great customer service in response to a query I had about the knife. Feels solid and comfortable in the hand, great for using around the kitchen for butter and bread cutting, and bacon flipping in the frying pan. Looking forward to going foraging with it in future. Many thanks Woodlore Team!  

16th March, 2024

Rated: 5/5

  3 of 92

  I previously purchased three knives, this the second time because of high satisfaction with first order. I intend to give these three as Christmas gifts.  

  John T. Fusselman
26th September, 2023

Rated: 5/5

  4 of 92

  Extremely sharp knife, good looking knife . Easy to open.  

  Hilton Bailey
3rd May, 2023

Rated: 4/5

  5 of 92

  Fantastic simple knife that feels great in the hand and agile to use. Love the colour. Price and next day delivery make me a happy man. Buy one!  

3rd December, 2022

Rated: 5/5

  6 of 92

  Bought as a work knife for horticulture and immediately fell in love with it, and it is now my favourite knife. Super simple and strong design, I can see why it's such a classic design that's hung around. Feels great in the hand, nice weight, solid locking mechanism. The loop on the bottom feels really strong and bonus colour scheme.  

5th October, 2021

Rated: 5/5

  7 of 92

  Bought in 2015. Still razor sharp. Excellent folding knife with a great story.  

  Gavin Henry
20th January, 2021

Rated: 5/5

  8 of 92

  Fantastic version of the legendary k55k. Wanted a stainless version to use for sea fishing. Great stuff.  

  Adam Davies
16th January, 2021

Rated: 5/5

  9 of 92

  Great simple folding knife. Lock mechanism is solidly built and functions very well. Blade is sharp but could do with an additional sharpening. Since the knife handle is a sheet of metal folded in two, the under portions, especially at the end of the handle can be rough and a little sharp. Possible filing can smooth it out. Other than that, Mercator K55K is a great knife.  

3rd January, 2021

Rated: 5/5

  10 of 92

  Great quality and accurately described. Arrived promptly.  

  Charlotte Peregrine
3rd January, 2021

Rated: 5/5

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