Interesting version of the separate "S" on Ebay.

ORIGINAL VIETNAM ERA RANDALL MADE FIGHTING KNIFE,BLADE IS 7 3/8 INCH LONG,OVERALL LENGTH OF KNIFE IS 12 1/4 INCHES,HAS THE MICARTA TYPE MATERIAL,GROOVED FOR HANDGRIP,THICK BRASS CROSSGUARD,BLADE IS DOUBLE EDGE,TOP EDGE STARTS 1 7/9 INCH FROM CROSSGUARD,BLADE MARKED ON LEFT SIDE-RANDALL MADE-ORLANDO,FL. S,THE "S" MARK WAS USED FOR BLADE BLANKS THAT RANDALL GOT FROM SOLINGEN,GERMANY,DURING THE VIETNAM WAR,AS THE DEMAND FOR HIS FIGHTING KNIVES WAS SO GREAT,HE HAD TO CONTRACT OUT FOR SEMI FINISHED BLADE BLANKS,RANDALL THEN PUT THE FINAL FINISH Item number: 120128254911