David (djd), I do have a record of the places (cities) that the numbers were found in. I was originally going to include it in database compilation of these numbers and still may do that.
I got a bit distracted by figuring out how to make a database output and this forum's codes and formatting rules work together. That is solved (hopefully).
I will see how the data I have ready (and to be done) fits on these pages and then perhaps add in the cities. Sometimes it is difficult or impossible to know what information might be of interest or use to future collectors in this regard.
However, the more ordered and sorted out, the better, as far as I am concerned.
Bee See, Nice link provided by Mr Robin Harris to the info on Swedish numbers.
So perhaps we should use the Swede's terminology for these so as to be consistent. The
1s and 2s are Cylinder numbers and the
6-Digit numbers are Serial or Counting numbers (KN in Swedish), lets go with
Serial numbers for now until the Scott and Unitrade decide to use different names, if no one has an objection of course.
2008 Sweden Lady Bug souvenir sheet with a Cylinder number at lower left corner and a 6-digit Serial number lower right. Photo courtesy Jay Smith dot com. Neat perforated lady bug too!

I noticed a Swedish booklet pane on
ebay Germany last week I believe that also had a Cylinder number on it. The seller called it a word that didn't translate. I will see if I can find it again.