Your partial photo is not much to go by, but the marks are Eibar, Spain proofmarks, and the 6.35 indicates it's chambered for the small cartridge known as .25ACP or .25 Auto in the U.S.
So it's probably one of the many small pocket revolvers made in Belgium and Spain, many of which have folding triggers. They are valued only as curios, rarely much over $100 in excellent condition. It's not an antique and may date to early 1900s.
Nice looking little revolver. I thinkhrf nailed it, small spanish pocket revolver in 6.35/25 auto caliber. These little handguns were popular in europe for a long time, early versions in various revolver calibers, after the rise of the small pocket autos they were also offered in 25 and 32 auto calibers as well.
Does it still function properly? While there is some collector interest in these, functionality often makes a big difference in value. If broken they are not easy to fix, no parts sources out there and they can be difficult to work on. I have sold a few over the years, the nicer ones in the $150-$200 range, broken ones will rarely bring a fraction of that.