Scarce (if not rare) Dutch Royal Marine Cutlass circa 1850, a variant of an earlier cutlass used by the Netherlands circa late 1700s early 1800s with a heavier fullered blade (see earlier cutlass at the UK National Maritime Museum).
Hilt is brass, simple D-guard with two side branches, forward swept upper quillon with barrel finial; wood grip with 20 grooves. Number "1" on underside of upper quillon on this example.
Overall length is ~29"; blade length is ~23-1/4". Double-edged, straight blade, unfullered, spear-point tip. "Crown over T" stamped into blade at ricasso (see images).
Scabbard is black leather body with brass throat and drag (missing on this example).