I decided that since Dave Strider F***ing owns at this game, I should draw his awesome sword. Admittedly, it's not exact, but considering that I haven't been able to get a good look at it I think it's a good estimate. I'm pretty sure his didn't have chains, or a record of that size.
Also, the reason it's called the half-blade is because in order to wield it, Dave's strife specibi indicates that the sword must have a blade that has been snapped in half. However, he gets around this be using some time bulls*** or something to alter the sword between the two states (of being broken and not broken) when he wants to in battle.
Edit: Added in the Timetables, which are used for even more time-related BS.
Half-blade (c) Dave Strider (c) Andrew Hussie