I thought this might be of interest:
The Kasuga Taisha Museum in Nara currently has a special exhibition titled "Appreciating Beauty of Swords", where they've got all six of their National Treasure sword fittings (along with a number of other impressive items, including several Heian-era blades and a massive ōdachi) on display. The exhibition will run until the 19th of April, and is well worth a visit if you happen to be in the area.
Unfortunately photography was not allowed, but they do have pictures and descriptions of at least some of the items on their website, so here's a little preview:
https://kokuhouden.kasugataisha.or.jp/en/e9/
https://kokuhouden.kasugataisha.or.jp/en/e19/
https://kokuhouden.kasugataisha.or.jp/en/e16/
https://kokuhouden.kasugataisha.or.jp/en/e14/