Any ideas? I haven't a clue. I suspect it is not complete whatever it is.

I believe the 1898 SAW 'relic' may be a Spanish naval 'contact mine', invented around 1885, by Spanish Navy Capitan Joaquin Bustamante.

Capitan Bustamante died July 1, 1898, during the land battle for Santiago de Cuba.

Where is this 'relic' located?

(I suspect those curved 'pivoting arms', on the "relic", are a model variation and were welded, at a later date, to prevent vandalism.

My hunch is that, they are a sort of 'trigger-guard', to prevent accidental detonation by smaller civilian watercraft & fishing boats.

They look like they stayed in the 'up' position, but, would slide and collapse, if hit by something "Big").

On a related note, memorials are one thing but discovering personal stories and walking the battlefields bring it too a much higher level. I began my tour of Ohio on the western side with tours of the site of Ft. Recovery and Ft. Greenville (both of indian wars fame). The City of Greenville is home of the Garst Museum/Darke County Historical Society. They have a great exhibit of military uniforms and weapons (see attached picture) donated by local veterans or their families - Span-am included but no Krags on display. If your ever touring the area, I recommend it.

The story of the Maine is a fascinating one for me.  I've read many of the reports, both past (blaming the Spaniards), and present (coal dust theory), and I agree that the destruction was most likely an internal disaster rather than outside influences.  There are many photos available showing the salvage of the Maine, and the operations (for the turn of the century naval technology) was a marvel of engineering!  After the bow, masts, and internal equipment, weapons, and other items were removed, the hull was towed out to the open ocean and scuttled.  The USS Maine was the first US Dreadnought/Battleship, and was already outdated when it arrived in Havana Harbor (photos of this also exist).

I've also toured the USS Olympia about 5 years ago.  Being an ex US Navy Petty Officer, I struck up a conversation with one of the care takers who happened to have served on the sister ship (and class namesake USS Forrestal CV-59) to my carrier, the USS Ranger CV-61.  Thankfully, this led to my being escorted throughout the entire ship, seeing places not allowed on the tour, including the entire engineering spaces.  Those triple-expansion reciprocating steam engines are amazing!  If you ever get the chance to visit Philadelphia, I highly recommend seeing this ship, as well as venturing across the river to Camden to see the USS New Jersey BB-62.