I'm in no way qualified to say, but the knife sure looks newer than the sheath. Is it just me? How about a shot of the front of the sheath?

The #84"S" was used, from time-to-time but not the norm. I, also, would have to see the front. Sometimes a handle-wrapped keeper strap was requested. The finger grips had nothing to do with it. Johnson roughbacks were the standard sheath provider even when finger grips were still being offered on 3/16" knives. The elimination of providing finger grips on smaller stock took place well after Sullivans was the sole supplier of Randall's sheaths.
Best, Capt. Chris

Here you go Capt. Chris, your help is appreciated. I love learning!

My guess was mid 1980's.

Eric

A "diagonal" keeper strap would have been stamped, simple 84. The "handle-wrapped" keeper predicated the "S". Nice knife and sheath combination.
Best, Capt. Chris
PS: The normal sheath that would have been given this knife...

My apologies for the photos above. I guess I am going to have to play with my white balance. The knife, along with the sheath, is no longer available. It has:
* Dressed stag
* All blue spacers (They look black in the photo)
I think both knives are late 1980's. (At least I know that mine is)...Here's older photos, showing the blue spacers better.
Capt. Chris

Nice little LowS from my collection

Really nice looking 8, very pretty wood.

its look like a homemade knife to me..

That would be "handmade" not home made.