Cool Charlie, Ok, if i were a betting man I would place a lot of money on your Knife being an Ulster Sir.
Forgive me Charlie as I am not trying to explain to you Sir- but trying to let you know how my Brain works and how I picked up the differences..........
I went through a very painful way of finding out about the Craftsman
Chrome Vanadium-etched Knives. Every time I saw these Knives people were calling them Camillus and it wasn't ringing true, so, I started buying quite a few Sears knives and looking through hundreds of online images and found that Chrome Vanadium Knives were Ulster's because of the differences I was seeing in the Blade shapes when comparing them to Camillus Tang Stamped or Sta-Sharp etched Knives.
I think I was on this path for many months, and one day I simply read a post from our extremely knowledgeable
Codger_64
in one of his threads confirming from Sears Paper work that this was so, I wasnt sure how I felt- whether I was a fool for spending all that time - but....I was quite rapt that I had found that out by doing comparisons and a lot of study rather than being told, ask a smart man what he would do and you may get a different answer

-
Here are the comparisons that show what I was seeing to decipher Ulster / Camillus made blades, as mentioned, when the Knives get smaller in frame, the blades are smaller and not so wide and picking up these differences can be a task at times near impossible.
These photographs are of the large Stockman / Cattle Knife size, Top knife in photo is Ulster - comparing the Sheepsfoot to the bottom Knife's Sheepsfoot which is Camillus.
Comparison of Ulster and Camillus Sheepsfoot:
Note Ulster's Sheepsfoot has that more " looming" curvature from spine to Tip compared to Camillus has an almost 90 degree ( exaggerated for the sake of description) sharper drop from the Spine to the Tip.
Comparison of Ulster Spey and Camillus Spey:
The top Knife again being ulster - showing the Spey Blade Shape, compared to the Camillus's Spey - the Knife at Bottom of photo.
So when I see that Spey like in your Knife Charlie, It kinda confirms things to me. In saying that though - there have been examples in the smaller Knives where one would swear they are all the same blades bar different Nail nicks etc, but the above comparison has lead me to a lot of the times being able to spot the Ulster before it's open- because of the larger Sheepsfoot “peaking" up when closed.