Wilkinson Logos:
The following images are from various Wilkinson Sword Company knives.
Etched logo on the Lovat Knife
Logo from the H.B. TuminP-2  blade.
Blade etching from the Col. SA Decker P-2 Knife
Logo from the Harley Britton P-2 blade
Below is a war-time logo on a P-3. I only have one other WW-II P-3 with a Wilkinson logo and it is too faded to get a photograph.
Now that you've had some practice, can you spot the Fake logo? The fake, shown below, is very easy to pick out. Maybe the incorrect spelling of sword is a clue! Let the buyer beware.
The next eight etches are all from original First Pattern Knives
Above: Late production (1960s?) Third Pattern Wilkinson
Below: 50th AnniversaryWilkinson Sword Co.  P-1
BELOW: Wartime gold plated P-2 by Wilkinson Sword Co.
Misc. Blade Etchings:
Above etching is attributed to J. Nowill & Sons.
Late 1980s logo etched into the blade of a black chrome plated P-3.
Late 1980s logo etched into the blade of a nickle plated P-3.
Above: Taylor "Eye Witness" brand from leather handled kinfe
Bottom: Ek Knife Company Model 2
Post war logos etched into the blades of two Nickle plated knives

Below: A very faint, late or post-war, logo on a Wilkinson third pattern knife.