Hey Charlie...
Here are my observations, they are on 3 Knives and importantly please note that these are unused as sharpening would change everything here.
One of these is the Son of yours that you just posted my friend.
The Ulster Old Timer shown in here with a Schrade Walden Stamped 3 bladed beauty ( the son of yours ), and a two Bladed Craftsman sfo -Sears.
There is always confusion of the Manufacturer between Ulster and Schrade - this Totally includes me, so having these three unused knives in front of me for a wee Study I am doing is a blessing, I was interested when you posted up yours with the ? of Ulster or Schrade.
There are differences between the Ulster Old Timer and the "what-I can gather-to be" Schrades.... if you would follow me and see what you think after this ( having one stamped Schrade Walden is great for the
"referencing to"...
The 3 Knives, The Schrade Walden, Craftsman and Ulster OT all share the exact same Frame, Pinned the same. Note the different Blade configurations on them.
When you see the Knives open together like this, and weren't looking for what we are, you would be forgiven to say- " hey- Blades Swapped around- same maker- same Frame etc.
But in the Photo ( Below ) here now- Look carefully at the Width ( from edge to Spine ) of the two Peach-Seed Delrin Schrade Walden Main Blade's and their Belly's emerging from the Tip down to the Edge, now the Ulster's Main is definitely not as Wide from edge to Spine, and has no Belly emerging from Tip- This difference is Slight I agree BUT there is a difference definitely when looking- and remember these Knives are unused, if you bring your head back and view these from a slight distance - it
very much stands out, now after looking at these for a few days I can immediately tell the difference between the two.
Next is the Spey Blades- I made a comment of the Spey on yours Charlie, and how it chops down on a 45 degree angle from the Spine, to the Tip ( obviously helps for the point to be taken down inside the Liner ), where as the Ulster leads more from the Edge up to the Tip and has a definite different profile as what the Schrade Built Knives do...
Slight differences again I know but the Ulster OT, doesn't have the severe "Cut Down" angle from the Spine towards Tip and most certainly
does not have the Belly from the Tip to Edge as the Schrade Walden does, The Schrade has the 'Beefier" Spey Blade .....
Extremely slight difference between the Pen Blades - where I thought there were none- and commented so after your Post Charlie Sir - but when looking Closer the Pen Blades are EXACT to each other on the Schrades, but when comparing them to the Ulster, they are slightly beefier, also the Ulster's Nail Nick is not as long, also a small but repeating difference is the Choil notch as well on the Schrades - none on the Ulster.
So the Summary that I can piece together here is that the two Knives with Peach-Seed Delrin - and one of them being a Schrade Walden Stamped Knife- the Other Stamped as a Craftsman ( which means it could be a Ulster, Camillus or Schrade ), after this look this Craftsman is definitely a Schrade.
The Schrade and Craftsman share the same Main, The same Pen, Same Peach-Seed Delrin and the differences stand out enough in the Old Timer to say that these Blades are most certainly different and therefore considered Ulster.
Hey...I could have this totally wrong, but from the pieces all fitting together- its looking to be so!
Charlie the edge looks similar to their ACA Edge ( Amazing Cutting Action )?