I got mine out and looked at it with a 10X loupe - I can barely make out the BOKER tang stamp on the main blade, but it appears to be somewhat larger letters than yours. The other two blades I can't find anything. The tangs on this knife are very worn.
Also, mine has grooved bolsters & matchstrike nick on the main clip.
Jigging looks same as yours, and slight serpentine shape - but mine is 4" flat closed.