The back side chevron

[captbob]

Hi , I currently own 2 M 9 bayonet's and I have not seen any info on the right side of the blade as far as the chevron's go , The one my wife bought me about 1987 has "BUCK" 188 and U.S.A and the chevron is pointed to the right > . The one that came over the counter at my old Pawn shop reads the same but the chevron is pointed up. I will try to get to photos lter if needed.
Thanks Capt Bob

[porterkids]

The marks you're talking about appear primarily on Buck commercial M9 bayonets. They are Buck date codes. Check out the chart at the bottom of the link:
http://m9bayonet.com/buck-phrobis-m9.html