For the Cluj post WW1 locals, notice they have TWO hand-overprints: one is a control stamp, which is round stamp or a straight line. This is easy to miss. The second is the "Lei" one. So, when used on documents, they actually see 3 stamps (including the usual the rubber stamp that ties it to the document).

All info and images courtesy: Valentin Robu

2 filler  ovp Lei date Apr 1923 letter
5 filler ovp Lei On piece February 1923
10 filler ovp Lei
50 filler ovp Bani on document w revenues without ovp
1 korona ovp Lei on piece
2 korona ovp Leu