They are not Japanese damascene and definitely do not appear to be shakudo.Photos too dark to see details,but they might be real/faux Siam niello .
Navajo style means little... it could be the white guy down the street who completed a few classes at...
Looks like simulated marcasite,the "silver" color is wearing off and scratched.
Considering the 10's of thousands of NA style jewelry made by hobbyist,etc. you many never find the maker's mark.
The "folding knife/tools" is also a set of allen wrenches.
Allen wrenches
Possibly made for the exhibition shop before USC took over..... https://pacificasiamuseum.usc.edu/exhibitions/current/
It's a 14K gold cobra ring with unknown stone type,do you have any info to add?
Sheet metal working hammer.... https://www.summitracing.com/parts/mtf-155g
There is what looks like a larger crystal in the third photo down at the 3 o'clock position,maybe turn the piece and get a clear photo of that area.
It's not jade with that crystal structure.
Doesn't look NA made unless it was a beginner since it is poorly constructed... open solder seams,solder globs on the exterior.Possibly a...
Possibly http://www.turnermarinegroup.com/downloads-and-faqs/ they made an exterior/marine mahogany veneer plywood which your first photo...
Company info here ............. http://www.oldcopper.org/makers/peerage.php
Size? Looks like part of a box latch.
Probably not a club,but only initials like this one... https://www.antiquers.com/threads/need-help.30098/#post-398671
The only things we ever found at Yorktown were fossil whale bone/sharks teeth,Chinese pottery shards and water moccasins.
Usually on the backside of the piece.They may be very small.Full size photos would help also,click the full size option before posting.
Just someone's monogram,without a maker's mark or country marks there's no help.
It could just be "property marking" in case of theft.
Separate names with a comma.
