Been meaning to try this for years, but didn't have enough nickels to feel like it was worth it. I had 4 dateless nickels I've found from nickel box searching that I tried this on. I found: 1916-S (turns out I was right about what I thought the date was!) 1918 1919 1921 This is kind of fun and honestly wish I had more dateless nickels to try this on lol. Of course I'd rather find ones with already readable dates, but still.
That absolutely can be fun. If you have a local dealer you like he probably has bags full of no-date buffalo's he would let you have for a song.