This IS a tough subject and stencils do change as pointed out, due to manufacturer and when and where the plane is in operation.
I'm looking for something solid for the He 111, something more complete than decal sheets.
About the 210/410, I have nothing useful on this except that it looks like octane triangles are on the main filler caps on the wings, (2 each side maybe?) a block of text is on each cannon barbette but it just looks like small black dots in the photos I have, and that some or all carried the last 4 digits of the work number on the nose. The restored 410 that's the subject of several walkaround books doesn't seem to have any stenciling on it at all
This doesn't help for 410 stenciling, but just in case you haven't seen this page-
Me410 Walkaround Index page.
