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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         71 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. Please note that Woodlore will need to verify your age before your order can be dispatched.


  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 14 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 71 customer reviews.

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

Overall Rating:


  1 of 71

  Simple, functional design. Beautiful colour. The blade was razor sharp. Tried and tested design, with a Woodlore touch.  

21st September, 2018

Rated: 5/5

  2 of 71

  Like many of the reviews I read here state, this is a really high quality pocket knife for the money. A great size blade, supremely easy and smooth to open and equally so to close. Very slim and light so no bulk when in your pocket, but sufficiently weighty and sturdy enough to give you confidence in using it. Very pleased indeed.  

  James Dennett
26th March, 2018

Rated: 5/5

  3 of 71

  This is a great knife at a great price (nearly half the price of some other competitors). I've been meaning to buy one for years, as it's s design classic, just as Opinels and Douk-Douks are, but when I saw that there was a Ray Mears version in green, I had to get it! My knife turned up super sharp, with great lock up and no blade play whatsoever. It's not the world's most sophisticated knife, but a reliable 'beater' that would provide useful service for years and holds a little piece of history too.  

20th March, 2018

Rated: 5/5

  4 of 71

  Great product so far. The blade could be a little sturdier (compared to a Leatherman blade), but very hard to find faults for the price - great purchase!  

10th March, 2018

Rated: 4/5

  5 of 71

  Beautiful piece of kit brings back many happy memories.  

  The Reverend
11th January, 2018

Rated: 5/5

  6 of 71

  Very nice knife, I bought it for picnicking and I think its absolutely ideal for that. Please be careful though, this thing is very sharp.  

  Bob Holland
7th January, 2018

Rated: 5/5

  7 of 71

  Fantastic service from Woodlore as always. This is a great knife, sturdy well made and razor sharp.  

  Chris Carter
13th November, 2017

Rated: 5/5

  8 of 71

  A beautiful and practical piece of history I recommend the Mercator knife without reservation.  

  Paul Biggs
28th September, 2017

Rated: 5/5

  9 of 71

  Excellent product. Exactly what I ordered. Delivered in 2 days. It had a good edge when delivered which needed a little sharpening to reach best working condition. Many thanks.  

26th September, 2017

Rated: 5/5

  10 of 71

  Generally a great knife for the price and the exclusive colour is nice although I would personally have preferred a carbon steel option. Out of the box the edge grind is rough and 'toothy' but much sharper than it seems at first glance and can be made even sharper. The only issues with the knife is that within days of receiving it the black paint in the black cat and K55K logos had severely warn off which is admittedly only a cosmetic issue, although a disappointing one. The other issue is a bit more serious in that the front end of the cutting edge digs in to the plastic spacer at the back end of the handle, causing me to have to run the blade over a hone steel regularly to get the edge true again. Over all it has it's flaws and yet still manages to be a great knife to handle and cut with.  

  Nicholas Wilson
23rd August, 2017

Rated: 4/5

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