With those thick spacers, and the black button sheath, I'm in full agreement with Rhett.
Mid to late 40's #4, hard to say, but definitely pre '50's.
I saw a similarly sheathed RMK model #3-6 with a stacked leather handle offered for $2200 yesterday...not to say that it did, or will, sell for that amount, but that's what the fellow was asking.
I'd say yours is closer to a 'real' value of $900 to $1600, dependant on who is doing the buying.
The keys here are the original sheath, stone, and the pinned ivory(?) handle.
Are there any sheath maker's marks on the sheath? What is the color of the stone. And is that ivory, or stag, material used for the handle?
I would strongly advise that you not clean or alter the knife in any way; and have it professionally appraised prior to sale, should you ever desire to sell it.
Nice knife, nice dad, and thanks for sharing it with us Stephen!
