Why were those fins put on the saber scabbards?
Because blacksmiths put all their time into making high quality swords, so that when it came to making the scabbards, it was a simple metal mold/press that would craft them, and little ironing out was done as it wasn't very important to. That, and if they got rid of those fins, there would have been a chance of the whole bloody thing falling apart! Sorry if this was answered already.
Sorry for not getting to this as soon as the thread went up. I'm really shocked by the progress of this so far. I'm vey excited for this, and still plan on donating.