Serial on Phrobis III 4th gen
 

I have an issued M9 Phrobis 3 with 4 line text, the ricasson has a 4 digit serial prefaced HM
http://www.old-smithy.info/bayonets/...%20ricasso.jpg

Any ideas as the only serialed oens I have seen are the Dutch ones

Hard to determine the significance of the letters & numbers. The markings appear to be typical of a U.S. set of metal 1/8 inch die stamps individually struck. I believe the Dutch numerals are panagraphed onto the blade. Perhaps they were applied by a soldier to identify his bayonet...

SInce seen another with a serial HQ so maybe a USMC stamp, however i have a demilled USMC blade without a serial

I seriously doubt that there is any USMC connection with this bayonet. It is an Army issue piece. Any USMC used M9s were marked USMC on the blade.

To the best of my knowledge there was no system-wide marking for the M9. I've seen many over the years that have had a mulitude of different markings that were placed by unit armorers to track the weapons.

Sorry dotn know where I went with this being USMC, was workign with my Buck USMC blade at the same time and got fuddled, this is as Bill says a standard Issue item army (airforce?) not USMC