1910 Sandersen Hooked Quillion Bayonet - Looking for help with authenticating

[ColinA]

Conservation means first and foremost "do no damage."
No cleaning or de-rusting would be the best choice (I.M.H.O.)
If you want to handle it or look at it just lightly oil it with a thin mineral oil. (NOT "spawn of satan" WD40!)

Long-term storage then do what the military did, cosmoline or wax-based coating. (Inspected occasionally.)