Fun trivia challenge, this.
I think Notts County and Grimsby have as well?
Both played in the Conference in 2021-22
Both played in the 4th tier numerous times, but most recently last season
Both played in the 3rd tier numerous times, but most recently in 2003-04
Both played in the 2nd tier in the early 90s, last season was 1994/95
And both played in the 1st division in 1901-2 and 1902-3.
Unlike us and Luton though, I reckon there's not too many people that have been to watch them play each other in all five divisions, mind!