Gentlemen (and Ladies):
I have an M1881 US Army Helmet Spike and Acorn/Leaf Base, free to a good home.
The spike and base are heavily patinated, showing that they have not been polished for many a year. Sadly, I do not have a spare nut-and-washer, but the spike has standard SAE threads, (6-32, I believe) and as the nut and washer would be completely within the helmet, a trip to the local hardware store should provide one with the necessaries.
First come, first served.
I have the honor to remain,
Your Obedient Servant,
Bvt. Captain Malachi Thorne