Hi John,
Welcome to Bladeforums. Those are sweet meant-to-be users. The knives have that 'old school' look to them.
I looked in my 1990 Knives Annual maker listing and came up with Martin Kruse, from Reseda Ca. No other with these initials.
Full time maker (then), a variety of fixed blades to swords, but no folders.
His mark was listed as 'initials'. Most likely?
EDIT: STeven posted while I was constructing. There it is!
Coop