I tend to agree with Crusader. The Buckle seems to be artisanal and therefore pre-industrial age. First part of the 19th century or earlier.
There is a Reference book (Whitehead) for buckles in Europe, yet in this Forum I noticed that its not fully congruently to America.
The last pic. seems to be the front end of a two piece button, yet it seems very large for a button. Hmmm...
The large non-ferrous object in the second row is horse / carriage related. I forgot the terminus technicus ... a sort of rein guide (Seen these advertised as medieval sword hangers or something often).
Greets
Namxat