Isn't the "Sneak" nomenclature something entirely made up in this country. Think about it. Does anyone really think that the Russians would care if 20 years after WWII that the Finns were building bolt-action rifles?
World politics is a deep subject. Applying local logic is not a good idea. Weapons without origin stampings is not a new thing.
I don't think the Finns gave a crap about what the Russians think.
For that matter, I don't think the rest of the world gives a crap about what a bunch of U.S. collectors think either. They live in a very real world of money and political intrigue.
The only reason any country would give a crap is if there is a market for their wares, real or fake.
The only weapons altered for the U.S. market en mass that I know of are the M/N snipers. When the Ukarinian or Russians figured out there is a huge U.S. market for M/N snipers, real or converted field rifles or not. That is besides the companies here in the U.S. that produced them by the crate full for the market.
It is interesting that the M/N thing probably brought untold thousands into the milsurp hobby. So that is always good.
There are others, but M/N snipers come to mind.
I do not know why they did them, but it is not uncommon to have scrubed guns. Yugo M48s by Zastava made a crap load of them to sell to Egypt without stampings.
They are called BOs. I forget the word they used for it, but translated it meant "without markings" They are sought after by SOME collectors.
Has something to do with politics of the region they are sold to. For whatever reason, some don't want the country of mfgr. known.
I once had a link, several pages on the arms of the former Yugoslavia. Anyone can google and maybe find it.
It is a study in arms of the region and how strange it can get. It is the same with Finns or any other country in that part of the world. Europe and Asia.
It is mind bending the money and people involved in the arms dealing and countries involved etc. Turkey was also a good read.
The intrigues are interesting.
Also a good read on markings of modern weapons would be to check out the Iran arms deal and Central American contra thing. Remember Oliver North and "I don't recall sir" at the senate hearings on the arms thing.
IIRC Isreal supplied some of the arms for deal but they had to be scrubbed or no deal.
It is complicated and as things go for now anyway, scrubbed arms will be out there.
SNEAK may be a handle we made up to describe rifles without markings. It is not a word from Finnland as far as I know.
There are other words to describe rifles with no stampings on them, but SNEAK sounds much more exotic for collectors. Maybe a marketing thing.
Trying to figure that out is like trying to determine how the handle Jungle Carbine got into use to describe a #5MK1 Enfield.
Lots of opinions and tons of pure B.S. no one knows for sure. Except for the guys that used them, who say they never heard of the term before.
So SNEAK works for me. But then I also bought TITO's private hunting M48 in exc. cond. No papers, but nowdays, "don't need no stinking papers" so I am good.