I've had this bayonet for a long time. Never thought it important enough to clean it.
Obviously this is Imperial or WW1-era.
Not sure though if it's German or Austro-Hungarian (or other).
There are no German inspection proofs and no date on the spine.
OK just read that these were actually made by the Turkish Military Arms Factory hence the AS.FA initials stamped on the hilt.
Glad this thing didn't cost me more than CAD15-20 from an army surplus back when I was still in highschool...