Nice knife. Someone did an excellent rehandle job on that one. The 148 was handled several ways, with phenolic impregnated wood (148WW Wonda-Wood or Stratawood), with leather washers and fiber spacers (148L), or with a delrin stagged handle (148S) for a brief time. In all instances I have seen, the knife had a hidden tang with the handle materials stacked on, and captured with a aluminum or occasionally brass pommel. When the 172UH was being developed (and the Imperial Kit Carson Trail Knife), the staglon was pinned with no pommel. The wood on your knife reminds me of the handle wood used on the first Buffalo Bill Bowies (BB166) from circa 1969 (first walnut, then African Rosewood). I cannot say for certain whether your knife is a factory custom rehandled one, or someone rehandled it after purchase, but it is not a production knife in that configuration.
A bit of background on the 148 you ask? Soitenly!!
The #148 "Hunter's Mate" was 9 1/4" overall with a saber ground carbon steel 5" blade, aluminum guard, Stratawood handles, birdshead pommel. First listed in 1954, it sold for $4.50 in 1955. The #148L "Huntsman" had a 9 3/4" overall length, 5" carbon steel saber ground blade with grooved thumbrest and upswept tip, "Wonda-Wood" handle with black and white spacers, aluminum guard, and aluminum birdshead pommel. It was cataloged in 1959. The #148LWE "Huntsman" had a 9 1/4" overall length, 5" carbon steel saber ground blade with grooved thumbrest and upswept tip with the serrated "Wonda-Edge", leather washer handle with spacers, aluminum guard, and aluminum birdshead pommel. It was cataloged in 1959. The 148S made it’s debut in 1963. Also called “Huntsman”, it has a “Genuine unbreakable Staglon” handle. Added to the 148S and 148L in 1967 was the 148STC, Staglon handled with Tungsten carbide blade. It listed at $8.75 while the 148S and 148L were $4.74 and $5.00 respectively. The 148 also came as a G3148-STC “Gaucho Set” with special riveted fold over sheath for $15.00. In 1968, the knives received names. 148STC Deer Skinner, 148S Deer Skinner, and 148L Huntsman. In 1971, the 148S was offered in a set with matchin handled ax, the X48S for $15.00. In 1972, the 148STC was dropped, leaving the 148L and 148S. In 1973 ½, these were dropped as the 498L and 498S were introduced in the “49er Series”.
I did not mention the sheath, which is not a Schrade production sheath that I am aware of. In all of my looking and seeing, I never saw them use a finial stud closure, or a screw type rivet to finish the stitch. None of this is a "Thus Sayeth...", just my own observations.
Codger