Hello!
Glad to see that the forum is back online and running!
Here is my last purchase.
A commercial 1987 Buck, second generation markings, buck markings on the opposite side of the blade and a distinctive "S" marking.
This bayonet was already discussed in two very old topics, here
http://www.quarterbore.net/forums/showthread.php?t=778
and here
http://www.quarterbore.net/forums/showthread.php?t=820
See, also, Bill's article about the last ditch of these "S" and "H" marked blades on Frank's website
http://www.usmilitaryknives.com/bill_porter_ii.htm