I have been watching for one of these for over a year and either the photos were not good enough for me to tell or I just have not been watching the right time but I was using the
ebay links off M9Bayonet.com and I found this baby listed:
USGI M9 M-9 Army issue Buck bayonet
Well, looking at the following image in this auction I believe this to be a Narrow Font 4th Generation Phrobis. One of the last Phrobis M9s I needed for my collection
You can compare the photos to my Wide Font 4th Generation Phrobis in the following photo or
on the photoserver here
I hope I am right on this one but if I am wrong I will know as soon as I have the bayonets beside each other.