Bingo.
It might be sanmai (3 layer construction) sandwiched by the fukurin (outer layer). I'm (*) the laymans terms for Ryan.
I'd have to see inside the openings (central and the one for the kozuka opening) to determine.
Ko-kinko is > than a sanmai tsuba, but -either way- a better tsuba that most people find when they start collecting.
Ko = (old) and Kinko = (soft metalwork). So it is an (old softmetal) tsuba of shakudo (type of special black pickled copper) with gold highlights. Condition looks decent.
The other iron one is hard to tell without taking it off the koshirae.
Most likely it is an Edo period katchushi (armor maker) piece. Larger but thin. @ryanvango is probably right that it is on the sword as part of the mix-n-match of WWII bringbacks.
There are even stories of guys using tsuba as poker chips. After the game, different tsuba ended up on different swords. Winner had more tsuba ? and the losers had a sword with no tsuba where they'd find a replacement later.
It is an old story, but it gives you a vibe of the mix n match we sometimes see.
There is the old story of the guy who brought a sword into the Tampa show.
Guy wanted to sell it. Benson told him he didn't want the sword (low grade, about $1000 then), but did want the tsuba.
Guy didn't want to separate them, so Benson bought the sword for (1k?), took off the tsuba and sold it for $5k within the hour. It would resell for $7k+ within a month or two.
Benson then gave away the sword rather than have to haul it back to Hawaii.
While a special case, sometimes the mix-n-match of WWII bringback koshirae pops up a few interesting one.
My own favorite ko-kinko tsuba came off a sword this way in the 2019 Tampa show. Not exactly worth $5k, but it was worth more than the Echizen shinto sword it was on.