This is an obsolete calibre Marlin XXX Standard 1872. Revolver condition is NRA Good with a 3" round ribbed barrel a nd hard rubber grips with a star motif and correct fixed sights and faint patent markings on side of barrel address, crisp & legible a t top of barrel - 4th Variation Long flu tedcylinder tip-up extraction with a spur trigger - bird's head grip, manufactured between 1873-1876 and mechanically sound.
Overall a decent example of a Marlin standard revolver. Low serial number so probably first made in the first year of manufacture in 1872.
Fired cases are ejected by removing the cylinder and using the static ejector rod under the barrel.
Marlin revolvers are somewhat scarce compared to other manufacturers as their focus was on competing with Winchester for rifles.