I came across this auction and thought it was interesting. I assume plenty of swords from smiths were presented to the Emperor. Might make for an interesting topic.   https://www.ebay.com/itm/Rare-Katana-made-for-Emperor-Hirohito-by-master-sword-smith-Akihide-NBTHK-paper/254594531672?hash=item3b47044158:g:37MAAOSwrHheufYh