CapnWilliam, you make several excellent points... and actually, the sword I referred to was indeed that... a sword. Curved and heavier than most, but still a sword. Short, heavy bladed cutlasses for hacking and slashing, would have been used by the men, not the officers. And they would have been handed out (along with boarding pikes, axes, and pistols) when the ship went to quarters... I'm speaking of naval ships at this point, but pirates acted similarly...
However, scabbard construction was FAIRLY standard (not to say there weren't exceptions)... most old swords I've seen that still have their scabbards (none older than the Revolution, unfortunately), were constructed of wood covered in leather or heavy cloth...