Thank you for the comments and all @johnb, @lis, @fiveten, @davem and @holzhamer
Blue dots!
As David and Pedro guessed it is French!
WNr 3247 of 1/JG.76 it is – captured by the French during the battle for france on this very day (30/5) in 1940 near St. Dizier.
I have run the curved side of my tweezers along the lines, and it appears it does help the decals sink in, but they are very thick! Should you want to make this one I highly recommend painting the marks instead – that way you only need the cn and 6 from the spares box!
The decals are from a set called “Messerschmitt in French colors” by Berna Decals, and contains markings for two Bf-109’s (an E-1 and E-3), a Bf-110 with invasion stripes! and an Me-262, all in French colors, so there are a lot of options to choose from!
next up - stenciling! And a few coats of varnish. And some wheels. And slats. And detail painting. Oh, well, still far to go before I come crawling over the line behind Pedros build in this challenge.