“Originally developed in response to restrictive knife laws in England that prohibited the carry of one-hand-opening lock-blade knives, the UK Penknife was the trailblazer of Spyderco’s unique SLIPIT™ line of knives. Now this iconic knife makes history again as the first non-locking member of our ultra-corrosion-resistant Salt® Series.

Its full-flat-ground, leaf-shaped blade is precision machined from nitrogen-enriched LC200N steel and housed in a high-visibility yellow FRN handle. A reversible deep-pocket wire clip and fully accessible Trademark Round Hole ensure that this fearlessly corrosion-resistant cutting tool is both left and right-hand friendly.”

OK that’s Spyderco’s original topo. Eventually it is the best way to describe it. I have had a UKPK as a gift at Amsterdam Minimeet. I think it was in GIN-1 steel and the blade was in another shape. But long story short the spring was so weak it was not pleasant to use.
What a great surprise on this Salt UKPK: at least the slipjoint locking system is much stronger than ever make it really a pleasure to use.
Of course, unlike on his little brothers: the Urban and the Squeak the UKPK is a four finger grip slipjoint folder with the index on the choil, used as the main security.

The choil on the UKPK (like the Military C36) is reminiscence of San Francisco Gambler’s boots daggers in the 19th century which means on the force during a cut is transfered to the blade directly not the handle and pivot. It is the Roman folding knife system where the handle was more considered as a sheath more than a handle.

The blade is thin and Spyderco provide one of the highest performance in cutting experience out of the box. My UKPK cut like a razor.
The performance on this one, geometry wise, are on par with Manly’s thin blades and even Opinel’s. It is not made for Midford’s fans.
There is a lot of European flavour in that leave shaped blade which looks a lot like the Caly3. It is some kind of UK Caly actually.

The Blade is long and pointy and requires less force to do the job as seen on my plastic bottle butt test. It has cut right in the middle steadily right in the thicker part of the matter. With your major finger on the choil you can shock up the blade for delicate works. Really it is versatile and polyvalent. Actually it cancel my need for a slipjoint Native. 3 inches blade on a 10cm handle, when Imperial meets metrics.
LC200N is a space steel which has shown great properties and not only in the stainless department. The users of the Spydiechef, like myself have found how steady the edge was kept and how easy it was to keep it fresh. LC200N has shown how it was forgiving (not chipping on mine) and ready to work long hours. A true workhorse steel !

Colour wise the yellow and black handle on the UKPK is very friendly. It looks like a scuba diving accessory. This is a knife made for going on the ocean. A real all terrain friendly companion. There is even a serrated version for the mariners with many rope and fibrous matter cutting tasks. The Salt collection is made for that: having a dirty knife in a sea salty socked pocket and not minding at all.
At 48 grammes (1,7oz) this is thought a travelling companion. The deep carry wire clip is a must even to wear it inside the watch pocket of denims.

There is no play in my UKPK. The spring retention is great. The jimpings are really positive under the pulp of the fingers. It is a serious contender to the hyper polyvalent Native Salt which has got one major issue in my book: its clip and a little more toyish and “boxy” handle. I know this really subjective but the UKPK handle feels more qualitative.
So here we got an all terrain slipjoint with strong mechanism and thin pointy blade. A knife impervious to the elements which can be clipped to a swimming suit and take care of oysters easily.
Really the UKPK Salt is one of the best Made In Golden folder and the first Scuba Diving Slipjoint. It is even a slipjoint which makes you forget it has no lock. Highly recommended.